Quote:
Originally Posted by Hib Halverson
I go 15,000 miles or every two years on oil changes, but....
1) I use Red Line 10W30, not Mobil 1. That allows extended drain interval
2) I change the filter every 5000 miles.
I've been doing this since I got the car.
The 3000 mile oil change was a valid choice 50 years ago, but not today. It's wasteful, inefficient and environmentally irresponsible.
As for oil use, the 90s were the only LT5s with no exhaust valve stem seals. GM found that, in practice, stem seals were needed on the exhausts and began using them in 1991 engines.
It was said earlier that the OE design of the LT5 with open deck cylinder case was prone to oil consumption problems.
I'm not sure that's true of stock or near stock engines and, given proper cylinder wall thickness, proper cylinder wall finishing and proper liner installation, I don't think it's true of modified engines.
I'd sure be interested to see any documentation and testing Paul Workman has to support his statement.
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To revive and old thread, after 5 months of not running at all, I started my '90 today, and let it idle for about 30 min. I noticed only when reversing back into the garage, a bit of blue oil smoke was coming from the exhaust. The garage had a burnt oil smell to it. I cant remember if the same thing happened last year or not. In any event, the car has 13,000km on it, and i probably put on around 900km last season. I checked the oil, looked clean, with a tiny bit of soot on the dip.
Not sure if the exhaust valve stem seal is the cause of the blue smoke or what?
What are your thoughts?