Hi, thanks all for the replies.
It's for a mate that asked me so I asked you's.
Those Temps are a High of summer and the Low of Winter so it's not always that hot or cold here.
Um, I'm not sure if it's the Pontiac or Olds engine.
1: Mineral first choice, I know you guy's all hate them, but all the High Performance part manufactures, speed shops and engine builders, and even a lot of oil companies tend to say that in those American 60’s 70 style, large clearance, old push rod V8, high lift engines, you get better protection out of regularly changing a Mineral oil often than a full Syn. still say to use them. Even Crower Cams and Cranks have a bit on there site saying use a quality Mineral oil, as the effect on ware with syn for out way the HP gains. Plus and we have a huge range of performance based minerals here, so I don’t know, but heaps of people use them and have for years, plus I also prefer to change my oil more often and have a clean engine with clean oil than a long drain interval one..
I think he is using Penrite HPR 30 that’s a 20w 60, very widely used, and Penrite is a company that goes out of it's way to prove you don’t need to run Syn's to have a top rate performance oil. Check them out at
www.penrtie.com.au, go to the HPR range and have a look.
I don’t think it's using much oil at this stage.
Thanks for all your help everyone.
Those Trans-am’s are such a tuff looking car! I would love to own one, but in Australia they pull big money. I'd love an 84 Trans-am but they also are still so expensive.