cadillacsevillests92 Posted February 24, 2005 Report Share Posted February 24, 2005 Hello everyone Im Big Fink, I really need some help tryin' to figure out what kinda motor oil I wanna swich too. since i have over 180k miles im switchin' all my fluids to High Millage. I was lookin' into Castrol High Milleage,does anybody use it and if you do could you tell me if it is any good? Ok the real ? is would it work if i swich from 10w30 to 10w40 motor oil? how about sythetic motor oil. i got the 4.9L Engine and I wasnt sure so I figured this whould be the best place for me to find out yall help'd me out incredbly last time I posted Please help me agian. Link to comment Share on other sites More sharing options...
Scotty Posted February 24, 2005 Report Share Posted February 24, 2005 The car calls for 10W30, you won't gain any appreciable benefit using synthetic oils. You engine is suseptible to a number one main bearing knock. It is especially prominent in the summer months when the oil is very hot. If you experience this you may benefit from mixing in some 10W40. It has been suggested that Rotella 15W40 oil would be helpful in the hot summer months, but don't use it in cold weather. Personally I like to act more conservatively, in the warmer months when you change your oil use two quarts of 10W40 and see how the engine reacts, if you like the results next time try 3 quarts, but do it in small steps. I had the number one main bearing knock in my 91 Seville 4.9 and in the summer months I used 10W40 100% with no trouble. The car however was often in bumper to bumper new york city traffic. The 4.9 is a good engine. I do believe that you can use 10W40 but its best to be conservative. I tried to use it only when the conditions called for it. Link to comment Share on other sites More sharing options...
Barry94 Posted February 24, 2005 Report Share Posted February 24, 2005 The best oil for your application is one of the heavy duty diesel motor oils that are SL rated and sold under the Delo/Delvac/Rotella brand names depending on what is available and/or whether you like Chevron/Mobil/Shell oils.... I could not agree more. I've been using Esso/Exxon XD3 since 1967 in ALL my cars. It's in the same category as Delo/Delvac/Rotella etc. The cost is a little more than the "off the shelf" brands, however it is far superior and costs much less than a synthetic. The local Police force here uses XD3 in all their fleet. Barry P.S. My lawn mower and snow blower get the same oil. They are both older than most people on this board. 2008 STS V82016 Colorado Z711970 Corvette LT-1 Coupe Link to comment Share on other sites More sharing options...
Scotty Posted February 24, 2005 Report Share Posted February 24, 2005 Not sure what is to be gained by "creeping up on it" by adding one quart at a time....LOL That's just me, Mr. Belt and Suspenders..... Since the engine calls for 10W30, I try not to contradict the manufacturer (who the hell am I? LOL). Thanks Guru.. Link to comment Share on other sites More sharing options...
JasonA Posted February 24, 2005 Report Share Posted February 24, 2005 P.S. My lawn mower and snow blower get the same oil. They are both older than most people on this board. Is it a "Lawn Boy" by any chance? Jason(2001 STS, White Diamond) "When you turn your car on...does it return the favor?" Link to comment Share on other sites More sharing options...
cadillacsevillests92 Posted February 24, 2005 Author Report Share Posted February 24, 2005 allright i changed my oil today,i decided to go with castrol 10w30 high millage i asked a cadillac mechanic he said it would work well,must admit Pearl is runnin a hole lot smoother. Link to comment Share on other sites More sharing options...
Cupillac Posted February 24, 2005 Report Share Posted February 24, 2005 Back in the summer months I switched to a Full Synthetic Oil, I was told a few weeks later on the Board that there is no need for it in the Northstar and it was a waste of money. Is a generic 10W-30 the best choice then? "Cadillac, it's not a car, it's an obsession" -W.Kingdon Link to comment Share on other sites More sharing options...
Barry94 Posted February 24, 2005 Report Share Posted February 24, 2005 P.S. My lawn mower and snow blower get the same oil. They are both older than most people on this board. Is it a "Lawn Boy" by any chance? No, it's a generic store brand with a 3.5 B&S engine. I thought Lawn Boys were two cycle . Barry 2008 STS V82016 Colorado Z711970 Corvette LT-1 Coupe Link to comment Share on other sites More sharing options...
tjtjwdad Posted February 25, 2005 Report Share Posted February 25, 2005 I've heard that the closer the two nembers are the better the oil. anybody else heard of this? Jim Link to comment Share on other sites More sharing options...
Ranger Posted February 25, 2005 Report Share Posted February 25, 2005 The closer the numbers, the less elastomers, polimers, rubberbands or something like that is in the oil. The stuff that make a 10w act like a 30w when hot. That stuff tends to develope sludge (or at least it used to) so the less the better. Guru HELP! Other than that, I have never heard "the closer the numbers, the better the oil". Oh, you already did, darn, your fast Link to comment Share on other sites More sharing options...
tjtjwdad Posted February 25, 2005 Report Share Posted February 25, 2005 Thanks! Also, for those who are looking for the Delvac (Mobile), Delo (Chevron) or Rotella (Shell) oils, you can get the Delo in 15W-40 for $37.99 for six 1 gallon containers at COSTCO. Jim Link to comment Share on other sites More sharing options...
maremrak Posted March 10, 2005 Report Share Posted March 10, 2005 I need to change the oil, and I have 96,000 miles right now. Will Rotella 15W40 be a good choice? They are very cheap at COSTCO right now. Bbobynski please advise. 1960 Sedan De Ville (sold) 1970 Coupe De Ville (sold) 1987 Mazda RX-7 (sold) Link to comment Share on other sites More sharing options...
Scotty Posted March 10, 2005 Report Share Posted March 10, 2005 Not on a Northstar this discussion was originally related to the 4.9, stick with 10w30 or 5w30 on the NS.... Mike Link to comment Share on other sites More sharing options...
maremrak Posted March 11, 2005 Report Share Posted March 11, 2005 Thanks Mike! 1960 Sedan De Ville (sold) 1970 Coupe De Ville (sold) 1987 Mazda RX-7 (sold) Link to comment Share on other sites More sharing options...
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