HT4100 4.1, 4.5, 4.9 Discussion, 4.9L Oil Consumption in Cadillac Engine Discussion; Originally Posted by Tailfin Maybe a happy medium here...like 15w-40? That's too viscous at operating temp....
- 12-22-13 08:43 PM #16Originally Posted by Tailfin
- 01-15-14 11:46 AM #17
Re: 4.9L Oil Consumption
Anyway, back on topic... '91 STS (almost 94K) goes through about a quart every 600-800 miles and I've seen black smoke in the rearview mirror occasionally when I give it the beans. '92 Fleetwood (114K) has needed nothing between changes. 5w30 during winter and 10w30 during the summer.
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