The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Best oil for a 292 I-6 in a 1967 C50?

newbraunie · 10-03-2008, 12:04 PM

I run Penzoil Platinum 10-30W Synthetic in my 292. It has been rebuilt with all new internals. I have read that this is one of the best synthetic motor oils produced. It out performs Mobil 1 in breakdown analysis tests. Wally-Mart sells it for $19.99 for a 5 qt jug. Here is a interesting link to Bob is the Oil Guy.com. Has everything you want to know about oils, lubes etc. You can send this guy a sample of your used oil for analysis, it will tell a lot about what is going on in your motor. Check out the forums also.
http://www.bobistheoilguy.com/index.html

Here is a quote from Bob is the Oil Guy
A lot of aftermarket additives use zinc and phosphorus for extra protection. The problem is, when you overload an oil with this type of additive, your oxidation levels tend to increase, causing an attack on the base oil, which in turn can cause an increase of viscosity, (thicken the oil) .This is why it is important not to play home chemist and blend in aftermarket additives that are not designed to be in the oil to start with.

10-03-2008, 12:04 PM	#24
newbraunie Registered User Join Date: Aug 2008 Location: Central TX Posts: 393	Re: Best oil for a 292 I-6 in a 1967 C50? I run Penzoil Platinum 10-30W Synthetic in my 292. It has been rebuilt with all new internals. I have read that this is one of the best synthetic motor oils produced. It out performs Mobil 1 in breakdown analysis tests. Wally-Mart sells it for $19.99 for a 5 qt jug. Here is a interesting link to Bob is the Oil Guy.com. Has everything you want to know about oils, lubes etc. You can send this guy a sample of your used oil for analysis, it will tell a lot about what is going on in your motor. Check out the forums also. http://www.bobistheoilguy.com/index.html Here is a quote from Bob is the Oil Guy A lot of aftermarket additives use zinc and phosphorus for extra protection. The problem is, when you overload an oil with this type of additive, your oxidation levels tend to increase, causing an attack on the base oil, which in turn can cause an increase of viscosity, (thicken the oil) .This is why it is important not to play home chemist and blend in aftermarket additives that are not designed to be in the oil to start with.