Charley B

Who recommended a 5w oil to replace a 20w?

LT Texan

Castrol on their website. Said that users of 20w-50 Syntec should use the improved 5W-50.

Mrmerlin

dont use that oil stick with mobil 1 15W50 or 20w 50
it might be worth sending Castrol a letter explaining what happened to your engine.
you have to go back to what you fixed last and that was an oil change to a lighter weight oil.
maybe the rings seized. due to lack of lubrication

LT Texan

I've contacted Castrol via their website and let them know what happened, the circumstance as well as their recommendation based on their discontinued Syntec oil. I'll see what they say, but I do think the oil did me in.

mickster

Check their disclaimers-and also check with a lawyer friend if you have one.

etmracing

I hate Castrol back in our racing days with British cars Castrol would drop oil pressure everytime. We stuck with Pennsylvania crude and they were great

mickster

WOW THIS:

http://www.castrol.com/castrol/gener...tentId=7032644


EDGE 5W-50 WITH SYNTEC
POWER TECHNOLOGY
EXCEPTIONAL ENGINE PROTECTION FOR CLASSIC CARS



Castrol has transitioned SYNTEC 20W-50 formulated for classic car engines to Castrol EDGE 5W-50 with SYNTEC Power Technology. Castrol EDGE 5W-50 offers performance improvements over SYNTEC 20W-50 in a number of key areas.

mickster

And this:

http://www.castrol.com/castrol/gener...tentId=7032644

OUR LIABILITY TO YOU
THE INFORMATION CONTAINED IN THIS WEBSITE IS NOT COMPREHENSIVE. DESPITE OUR EFFORTS, IT MAY NOT BE ACCURATE, UP TO DATE OR APPLICABLE TO THE CIRCUMSTANCES OF ANY PARTICULAR CASE. WE CANNOT ACCEPT ANY LIABILITY FOR ANY INACCURACIES OR OMISSIONS (OTHER THAN FOR FRAUDULENT MISREPRESENTATION) IN THIS WEBSITE AND ANY DECISIONS YOU MAKE BASED ON INFORMATION CONTAINED IN THIS WEBSITE ARE YOUR SOLE RESPONSIBILITY. NEITHER BP Lubricants USA, Inc., NOR ANY OF ITS AFFILIATES ACCEPT LIABILITY FOR ANY DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL OR OTHER LOSS OR DAMAGE OF WHATSOEVER KIND ARISING OUT OF ACCESS TO, OR THE USE OF THIS WEBSITE OR ANY INFORMATION CONTAINED IN IT.
YOUR USE OF CASTROL.COM/US IS AT YOUR OWN RISK. CASTROL.COM/US IS PROVIDED ON AN “AS IS” AND “AS AVAILABLE” BASIS. NEITHER CASTROL OR ITS AFFILIATES WARRANT THAT CASTROL.COM/US WILL BE UNINTERRUPTED OR ERROR FREE; NOR DO THEY MAKE ANY WARRANTY AS TO THE RESULTS THAT MAY BE OBTAINED FROM THE USE OF CASTROL.COM/US, OR AS TO THE ACCURACY, RELIABILITY OR CONTENT OF ANY INFORMATION OR SERVICE ON CASTROL.COM/US OR INFORMATION OR SERVICE OR PRODUCT ON ANY OTHER WEBSITE ACCESSED THROUGH CASTROL.COM/US.

LT Texan

Yep. That's what got me. Improved 5w-50 over Syntec 20w-50.

We put recommended Castrol in our X5, but I just think this was a bad recommendation for our 928's.

I'm old. I'm a 10w-40 Dino oil guy (for American iron). But I was very happy with the 20w-50 Castrol Syntec. It was great.

I've initiated a dialog with Castrol. Let's see where it goes.

mickster

Fingers crossed! This sucks.

LT Texan

All that, but go to their website, put in Porsche, 928, 1982 (that is the earliest year as an option), 4.5L - and Castrol says 5w-50 Edge with Syntec is the right oil for your car.

Leon Speed

I'm no expert by any means but I have a hard time believing this is due to switching from 20-50 to 5-50. 5-50 is still ok to use (sure preferably 20-50). Also by the way you describe it the engine cut out suddenly. Makes me think something else happened suddenly. What was the verdict on the empty coolant tank? Is it possible the coolant washer the cylinder walls?

Also, as you noted, the scoring is on the cylinder wall axial to the crank. Did you measure crank end play? Again, just observations from your pics.

LT Texan

No loss of coolant. I use a clear coolant and the mechanic was looking for green.

I didn't measure crank end play. Can take a look today.

jcorenman

Dan,

How do the rings look, up close? From your pic the compression ring looks scuffed but it is hard to tell from the picture.

I would also send a sample of the oil that you drained to Blackstone (or another lab) for analysis, as well as a virgin sample of the same oil, new. And if you still have any of the Castrol 20W-50 that you were using previously, I would send that also.

What was the oil pressure doing just prior to it shutting down, do you recall?

ALKada

Have you examined your oil pump?