I was running the 10W-40 100% synthetic in my 1964 Impala for years, dating back to 1985 when I restored the car and the 283 V8. I ran it for 1 hr at 2000 rpm when it first fired, then ran it for 100 miles and changed it over to synthetic. 17 yrs later, it had never gone down any amount and I only chaged oil every 3 yrs which amounted to approx 5000 miles. I just could not see changing the oil every year and more times than not winter came on before I got anound to it anyway. 2 years ago I replaced the valve cover gaskets because the cork ones had turned brittle and were weeping (looked bad), the inside of the heads where like the day I assembled the engine.
Sold the car last spring thought with about 50,000 miles on it and it was in perfect condition.
[ January 29, 2003, 06:31 PM: Message edited by: Mike ]
Sold the car last spring thought with about 50,000 miles on it and it was in perfect condition.
[ January 29, 2003, 06:31 PM: Message edited by: Mike ]