Oil Change remorse

Messages
48
Location
Minnesota
Yesterday I changed out my M1 5w30 which I have been using for all changes for the last 30,000 miles on my 5.3 chevy silverado. I put in the Truck and SUV 5w40 as it has been higly praised so far. I have not had any consumption of the 5w30 in the past. Will using a 40wt over the 30 that was giving me no problems possibley losen up anything that may make the engine start to use some oil? After all GM Specifies 30wt for a reason right??? Am I worring for nothing? Guilt has set in..
 
Messages
296
Location
Eldora, Colorado 9000'
I've been running Delvac 1 5W40 (Mobil 1 TSUV) in both Toyota V6 Trucks where toyota specs 5W30. It gets well over 100df here for 4-5 months a year. Sometimes up to 130dF on the pavement. I don't think there's a better oil out there for this kind of heat. All of our driving is stop and go with a lot of cold starts. I'm worried about fuel dilution. I know Delvac handles contaminants very well being a mixed fleet oil. You won't have anything to worry about. I'd run it year round since they'll both flow the same in cold weather!
 
Messages
824
Location
San Jose area, CA
I use Delvac One 5w40 in a TDI (turbo diesel) I also use Mobil One in TLC's and Corvette Z06. In addition I use 15,000 mile intervals on the Mobil One 5w30 products. Since Delvac One 5w40 aka Mobil One Truck and Suv is SL/SJ (backward compatible) and is C1-4 rated, I would not hesitate to use Delvac One as a substitue for Mobil One. However the same is NOT true vice versa in the TDI (turbo diesel) Delvac is actually a better oil than Mobil One.
 
Messages
164
Location
USA
I'm using that oil in my Accord V6 now and think it will be good with summer coming up. Possibly I might use a mixture of the 5W40 with the 0w30 R for the colder weather come next winter. I "think" the 5W40 truck/suv oil might be just a pinch thick for winter time. [ April 13, 2004, 10:46 PM: Message edited by: Hankrr ]
 
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