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Thanks guys.

Yeah. This is a beater, so I'm not going to use Amsoil on this one, but I want it to last and I'd also like to clean up the insides. I want the best $$/peace of mind ratio.

Originally Posted By: bobfather99 Actually, any dino oil will work. Id just use something cheap with a decent filter. How about Supertech, or the Autozone special, 5qt jug of house brand oil/STP filter for $10?? I figured I needed the HD oil since the 307 is a old-school design. No?

What do you guys think? I'm leaning toward running Delo 15w40. This is a 109,000 mile motor that I fear has skipped a few oil changes lately. I will run Auto RX regardless.

Originally Posted By: OilGuy Q St and Valvoline do NOT meet the GM 4718M spec - at least according to GM's approval list. From Valvoline's SynPower page: Exceeds all car and light truck manufacturer’s warranty requirements for the protection of gasoline, diesel and turbocharged engines where...

I'm running my first batch of Amsoil 10w-40 in my '79 Cadillac (425.) Looking forward to my next UOA to see how she likes it.

Valvoline SynPower 5w30 also meets the spec.

I bought out the local store's supply, 6 gallons. Great deal.

Nice truck.

Leaks ... certainly not cool. I suppose I could try, and always go back to something like the MaxLife if need be. I'll give it some serious thought. I'm also interested in Auto RXing the older cars, as well as the '00. Should I be careful with that on the older cars?

Thanks, but she's in pretty good shape at this point.

I'm impressed with the Amsoil talk I've read here and elsewhere. Any suggestions on viscocities recommended for my apps?

I have a 2000 DTS with the Northstar (80k), a 2005 CTS with the 3.6 (25k), a '76 Fleetwood with the 500 cid (32k) and a '79 Deville with the 425 cid (46k). I'd like to go with true (Class IV and up) synthetics for these cars, both for the cleaning properties and the lengthened OCIs. The CTS...