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Anyone know what is a decent top up oil with GC that is OTC? I am a half quart low and can't fond GC anywhere. Suggestions? I was thinking of tossing some M1 15-50 in for the #@$%! of it.

http://www.animegame.com/cars/Oil%20Tests.pdf What flaws are there with this study? A resident triboligist claims this study doesn't mean anything due to a lack of "engine sequences". Are Royal Purple and Valvoline are now the new BITOG darlings? Sorry if this is a repost.

Flame away if not true: I have heard from a few sources that Bosch recently bought Purolator, therfore Bosch filters at Autozone are the same product. Your $.02? Bill

I searched and found 2 posts with nothing real definate. Just would like to know what the general consensus is. Seems like most people only run GC in the winter and I'd like to know why since everyone claims it to be close to a 40 weight hot. The vehicle is a 99 VW passat V6. Thanks Sorry...

He is implying that the 0-40 I've been running may be TOO easy to pour (high or low viscosity?) when cold and is running out of the cam chain tensioner piston which takes a second or 2 to pressurize and fully tension the cam chain. he also thinks its a good move as far as sealing the piston...

Wow, that UOA seems pretty impressive based off of the responses with the post. I'm going to try the 3:1 ratio of 5/30 and 15/50 you recommend. I took a look at a couple 0-30 GC UOAs on engines over 100k and they seem a bit higher than what what you posted.

First time poster, long time lurker here. Currently run 0-40 M1 with no consumption but theres some cam chain tensioner rattle upon startup which initially I though was a pulley bearing going out. My indy (deals with older VWs mostly) recommendeds moving to 15w50 M1 to help quiet the motor. I...