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Castrol Edge 5-50 Synthetic

Posted by DB Wood

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Re: Castrol Edge 5-50 Synthetic #21
Rod H. Amity, Oregon, USA 1964 MG MGB 1968 MG MGB GT	Posted: March 30, 2012 11:23AM Registered: 9 years ago Posts: 14,987

In reply to # 2026683 by Scott P Where do people get away with calling a 50 weight oil "thin"? Are they reading it wrong?

There is a misunderstanding. Dan and Terry are correct, in that 5w50 and 20w50 should both be 50 weight at hot operating temperatures. The lighter weight at colder temperatures can only be a good thing, as oil pressure would be achieved sooner, and full lubrication quicker. I'd try it, except that I don't have to drive my cars when it's below freezing, and I have a full shelf of VR1 that I bought on sale.

To the pure, all things are pure...

'63 MGB
'68 MGBGT
'80 VW Vanagon Kombi
'09 Mazda 3 with 5 speed manual

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Re: Castrol Edge 5-50 Synthetic #22
ingoldsb Terry Ingoldsby Calgary, Alberta, Canada 1971 MG MGB	Posted: March 30, 2012 09:20PM Registered: 9 years ago Posts: 9,752

Quote: Where do people get away with calling a 50 weight oil "thin"? Are they reading it wrong?

Clearly a 50 grade straight weight oil would be very thick. But in this case, we are talking about 5w-50. So, at cold temperatures the oil behaves like a 5 weight oil (in the "w" winter or cold test) and like a 50 weight oil in hot temperatures.

In actual fact, multi-grade oil is actually closer to being constant viscosity - hot or cold. I'm not sure if that makes it thick or thin. smiling smiley

If you ever try to pour 20w-50 oil in very cold weather, it has the consistency of honey! 5w-50 pours easily in very cold temperatures, but is no thinner than 20w-50 at full engine operating temperature. It is really the best of both worlds. Easy flow on startup with no breakdown at high temperatures. Plus most (all ?) of the 5w-50 oils I've encountered have adequate ZDDP for our engines.

Terry Ingoldsby
terry.ingoldsby@DCExperts.com

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Re: Castrol Edge 5-50 Synthetic #23
bearun Ted Barron Bowling Green Ohio, USA 1969 MG MGB 1974 MG MGB GT	Posted: March 31, 2012 03:32PM Registered: 3 years ago Posts: 3

I have used Castrol Syntec (Edge) 20w50 for the past couple years and have been pleased with my engine's performance. My local auto parts store has to order it for me.
I've always been uneasy about the wording on the label--"Increased antiwear additive to help prevent flat tappet camshaft wear" It doesn't mention zink/phosphorous and inquiries about what the additives are fell on deaf ears at Castrol.
I don't want an oil that helps prevent the wear--I want one that does prevent it. I just bought a case of Brad Penn 20w50 patial synthetic high performance oil that "Contains high zinc and phosphorous additive concentrations..."
Ted

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Re: Castrol Edge 5-50 Synthetic #24
9146 rick dentel yardley, pa, USA 1970 Porsche 914 1978 MG MGB 2002 Mini Cooper	Posted: March 31, 2012 03:59PM Registered: 1 year ago Posts: 1,355

Somebody better call Porsche they recommend 0-40 Mobil1 for the Carrera.

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Re: Castrol Edge 5-50 Synthetic #25
ingoldsb Terry Ingoldsby Calgary, Alberta, Canada 1971 MG MGB	Posted: March 31, 2012 05:26PM Registered: 9 years ago Posts: 9,752

Quote: I've always been uneasy about the wording on the label--"Increased antiwear additive to help prevent flat tappet camshaft wear" It doesn't mention zink/phosphorous and inquiries about what the additives are fell on deaf ears at Castrol.

I think you are unnecessarily concerned. Castrol's website seems to be gimped right now, but the cached version of the page (on Google) shows the additive to be ZDDP. If/when Castrol's website recovers, you should be able to see the whole page at http://www.castrol.com/castrol/genericarticle.do?categoryId=82915470&contentId=7032644

This page doesn't show the level of ZDDP, but I know I found it before and I seem to remember it was ~1200 ppm (1150 seems to stick in my mind).

Terry Ingoldsby
terry.ingoldsby@DCExperts.com

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Re: Castrol Edge 5-50 Synthetic #26
ingoldsb Terry Ingoldsby Calgary, Alberta, Canada 1971 MG MGB	Posted: March 31, 2012 05:30PM Registered: 9 years ago Posts: 9,752

Here is a link (to Castrol's site) that seems to work properly.

http://www.castrol.com/castrol/genericarticle.do?categoryId=82915470&contentId=7032644

Note that the new 5w-50 is the replacement for 20w-50 - and better in every way!

Terry Ingoldsby
terry.ingoldsby@DCExperts.com

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Re: Castrol Edge 5-50 Synthetic #27
trewjohn2001 John Trew Mallorca, Spain 1969 MG MGB GT	Posted: March 31, 2012 06:20PM Registered: 2 years ago Posts: 334

Being thinner when cold isn´t the 5w50 more likely to leak out onto your garage floor devil smiley

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Re: Castrol Edge 5-50 Synthetic #28
favedave David Church Saint Joseph, MO, USA 1967 MG MGB GT "Marilyn" 1995 Ford Probe 1995 Ford Probe "The Probe"	Posted: March 31, 2012 07:37PM Registered: 2 years ago Posts: 1,822

It's a British Car, it will leak no matter what weight oil is used.

Personally I favor parafin-based straight 30-weight from Big Lots for $.99 a quart. But my GT is a bit more persnickety so I pander to it with Castrol. (I wish it still smelled like it did in the 60s)

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Re: Castrol Edge 5-50 Synthetic #29
DB Wood Daniel Wood Bend, OR, USA 1969 MG MGB GT "Clyde" 1970 MG MGB GT	Posted: April 01, 2012 12:19AM Registered: 7 years ago Posts: 3,320

I think the 5 number is scaring a lot of people. We have seen 5wt oil pour like water at room temperature, but that is not what happens in the 5-50wt oil. It will pour like 5wt at 0 degrees F, and act like a 50wt at 212 degrees F. That means that in the temperatures, in between, the oil has the viscosity somewhere in between the two extremes. At 100 degrees F it might have the viscosity of a 30 wt at that temperature. I just have to look at the oil pressure gauge to know what's good and what's bad. My combination gauge is the best gauge there is. It can show you things, if you know what to look for, that no other gauge can, due to the fact that it is un-damped and very accurate. All the other oil pressure gauges in the B's over the later year are crap. There, I said it, and it's my opinion of course. The UK cars I believe kept that gauge to the end, does that tell you something? 5-40 and 5-50 are great for our cars. Some have said they leak or burn, but that has not been the case with mine.

Dan Wood
70BGT driver, OD, Pertronix, HS4's, Peco, .060 over, Elgin cam, Superlite wheels, poly bushings, panhard rod, rear tube shocks, 1" lowered front end, HD shock valves, etc, etc.
69BGT project (V-6?)
88 Saab SPG Turbo
86 Vanagon Westy (South African conversion engine 2.0 OHC 135HP)

Lucas= Loose
Unsoldered
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And
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Re: Castrol Edge 5-50 Synthetic #30
trewjohn2001 John Trew Mallorca, Spain 1969 MG MGB GT	Posted: April 01, 2012 01:21AM Registered: 2 years ago Posts: 334

Thing is the synthetic oils are expensive here, will they extend engine life? If I'm spending that much more on oil changes in the long run the money saved using dyno oil would pay half the rebuild costs. Or is it safe to extend the oil change intervals like modern cars do? I'm sure synthetics are good but is most rod bearing wear down to design of the engine or the oil were using? If the 5w50 flows like hot 20w50 on startup that has to be a good thing?

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Re: Castrol Edge 5-50 Synthetic #31
Jim1971 Jim Smith Cassidy, BC, Canada	Posted: April 01, 2012 01:52AM Registered: 9 years ago Posts: 5,628

I use full 20W-50 synthetic in Green B. The reasoning is that in very hot weather when the engine temp is just above the N the oil lubricates well and isn't suppose to loose its' properties due to high engine temperatures.
When we went on a road trip in May that involved a OAT of 10 degree F, coasting down a long mountain road and the engine cooled down to 1/4 of the way between N and C the oil pressure stayed consistent.
Synthetic will lubricate better thru a wider range of engine operating temperatures.
The stuff is a lot slipperier than dino oils.
Oil and filter changes are still every 4000 miles.
The synthetic oil doesn't leak from the engine either or end up going out the exhaust.

Jim...Nanaimo, BC
1971 MGB collector
1975 MGB driver
1975 MGB in pieces waiting for V6
2005 Mini Cooper

A wise man overhauls his brakes before his engine.

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Re: Castrol Edge 5-50 Synthetic #32
ingoldsb Terry Ingoldsby Calgary, Alberta, Canada 1971 MG MGB	Posted: April 02, 2012 01:07AM Registered: 9 years ago Posts: 9,752

Quote: I use full 20W-50 synthetic in Green B. The reasoning is that in very hot weather when the engine temp is just above the N the oil lubricates well and isn't suppose to loose its' properties due to high engine temperatures.
When we went on a road trip in May that involved a OAT of 10 degree F, coasting down a long mountain road and the engine cooled down to 1/4 of the way between N and C the oil pressure stayed consistent.

You are correct about the virtues of synthetic in hot weather (or if the engine overheats). Given that you encountered quite cold temperatures in your trip, you might have preferred the 5w-50. All the benefits of 20w-50 in hot conditions and much better performance in the 10F temperatures.

Terry Ingoldsby
terry.ingoldsby@DCExperts.com

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