M1 vs Delvac

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132
Location
Ga.
Okay folks, I'm new to the board and have been reading good things about Delvac. Here is my question- Which would be better for my 2000 LS1 Firebird, 85 Mustang, and my Kia. In my 1st post I stated that I had been using 0W30 M1 in the LS1 and the Kia with no oil consumption problems. I reckon I really need to step up to 10W30 at least in the summer-right? So which is it-5W40 Delvac or M1 in 10W30 or maybe 10W40? Inquiring minds need to know from Knowlegable minds!
 
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3,682
Location
Chattanooga, TN
Well, most people will probably say to step up to the 10W30. My question is why? If the engines are operating fine, if you have no oil consumption and leak/seepage issues then why change. Is appears that you have not had an analysis done so I would suggest that to see if the 0W is doing its job, then maybe change. Like your spouse or girlfriend, if she is still performing her functions and you are satisfied a change can be a huge hassle and the grass is not alway greener. In fact it could be a cow pasture full of cow chips. [ August 22, 2002, 08:44 AM: Message edited by: Spector ]
 
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349
Location
Quebec, Canada
Judd, As for 10W40, I think AMSOIL is the only one that makes a full synthetic with that weight. I could be wrong, of course. As for your other comments, I'm going to second Spector's comments. If the engine is tickity-boo with the oil you're using, then I say stick with it, and run some analysis to confirm. I suggest using 5W40 oils only if you do: - a lot of high speed driving (excess of 65mph). - high load (trailer towing, heavy loads in trunk, etc.) - have some slight oil consumption due to oil burn-off. Regards, Oz
 
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2,077
Location
Cordelia, CA
As we have seen in the analysis section, oils don't always behave as we would expect them too. My knee-jerk reaction is to say, switch to 10W30, or better yet, 0W40(which is nothing like the other formulations) You are running $20-25 worth of oil with each change. My advice is to run an analysis on each vehicle, at the normal oil change interval, and see how each is doing. Some may shock you, some may leave you pleasantly suprised. It's all in the application.
 

Patman

Staff member
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21,988
Location
Oakville, Ontario
quote:
Originally posted by The_Oz: Judd, As for 10W40, I think AMSOIL is the only one that makes a full synthetic with that weight. I could be wrong, of course. Oz
Redline also makes a 10w40 synthetic.
 
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903
Location
CA
Other manufacturers that make 10w40 include Mobil Castrol Motul Pennzoil Valvoline Silkolene Torco Klotz Golden Spectro and few others. Most are for motorcycles but there's nothing wrong with using them in cars.
 
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1,933
Location
Oklahoma
Judd, How many miles are on the Kia and have you noticed any weepage from the front and rear main seals? How many miles between changes on the Kia? It's a Rio correct?
 
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531
Location
Columbus, Ohio
Mobil 1 10W-30 is perfect for all your vehicles. Churning a too heavy oil (40W, example) in an engine which does not need a 40W is creating heat, robbing horsepower and doing nothing positive for your engine. There is no substitute for viscosity, to the point of optimum viscosity thickness. Anything thicker and we start down the other side of the power curve.. George Morrison
 
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2,077
Location
Cordelia, CA
As I've said before, I don't run 0W40 for the viscosity, I run it for the formulation. If Mobil would release a 10W30 that was as good as the 0W40 I'd run that. So I feel that the counterproductive effects of the vis, are more than offset by the formulation.
 
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302
Location
Chicago
quote:
Originally posted by GeorgeCLS: Mobil 1 10W-30 is perfect for all your vehicles. Churning a too heavy oil (40W, example) in an engine which does not need a 40W is creating heat, robbing horsepower and doing nothing positive for your engine. There is no substitute for viscosity, to the point of optimum viscosity thickness. Anything thicker and we start down the other side of the power curve.. George Morrison
Power-curve-shmower-curve: I'll gleefully sacrifice some pick up and MPG if it means my engine will last longer!
 

Patman

Staff member
Messages
21,988
Location
Oakville, Ontario
quote:
Originally posted by GeorgeCLS: Mobil 1 10W-30 is perfect for all your vehicles. Churning a too heavy oil (40W, example) in an engine which does not need a 40W is creating heat, robbing horsepower and doing nothing positive for your engine. There is no substitute for viscosity, to the point of optimum viscosity thickness. Anything thicker and we start down the other side of the power curve.. George Morrison
Don't get me wrong, I'm a big fan of 10w30, and it's probably the only viscosity I'll ever run in my 95 LT1 Firebird, however I do think that one step higher, to a 40wt, won't hurt a thing other than a slight drop in MPG and a little bit less horsepower. As long as it's a middle to low end 40wt, it's not going to make much difference compared to a thicker 10w30 such as Amsoil which is almost a 40wt anyways. Keep in mind that Mobil 1 10w30 is thin enough that it's not too far off from being a 10w20. Under very hard driving I don't know if I would feel too comfortable with that in my engine (which is one of the reasons I no longer use Mobil 1 in my Firebird)
 
Messages
263
Location
DFW, TX
Are there any big chain stores that sell the D1 besides Wal-Mart? I am thinking of giving it a try, but I'm not willing to pay truck stop prices for the oil and none of the North Dallas Wal-Mart's that I've been to (4 of them) carry it.
 

Judd

Thread starter
Messages
132
Location
Ga.
Thanks everyone for the responses. The Kia is a Rio and it has about 10K on it now. Not enough miles to see anything yet.
 
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