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1996 Cadillac Seville SLS
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57 Posts
Discussion Starter #1
Hey guys... A friend just gave me a few boxes of oil he didn't need. My dash says oil is 9% life, and I am about to do an oil change in the next day or so. Here's the thing--> The oil is Citgo Superguard SAE-40, and it says recommended for "Diesel" engines. It does say it can be used on gasoline engines though, and I want to know if this oil would be ok in my 96' SLS? Don't want to make a big mistake if ya know what I mean!!

Until now all she has had has been castrol 10W40... :stirpot:
 

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95 Fleetwood Brougham / 01 DTS / 11 CTS Lux / 11 DTS Platinum
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7,085 Posts
The diesel part won't hurt anything at all. It's just got some extra cleaners in there. The real problem is what the heck are you doing with 10W-40 in a N*. Dude 5W-30 or 10W-30 MAX, 10W-40 is to thick for the engine.
 

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1996 Cadillac Seville SLS
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57 Posts
Discussion Starter #3
I don't even know what the difference is to be honest... I just bought the car a couple months ago, and I am almost positive the previous owner said 10W40. Maybe 10W30, I can't remember. Why can't the Northstar handle the 10W40?
 

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Administrator
2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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69,133 Posts
:thepan: Take a real hard look in your owner's manual. Find the section that deals with recommended lubricants. Oil is not "oil". There are many factors taken into account by manufacturers when they recommend or specify different lube grades. UNDER NO CIRCUMSTANCES run straight 40 in a N*. If you live in the desert with nighttime temps of 80 degrees and day temps of 120 +, 10W-40 might be OK. Stick to the recommended 5W-30 or 10W-30 for happiness and longevity. Why??? Engines are built with internal tolerances calculated for the normally expected service. N* engines are built to a moderate viscosity tolerance of 5 or 10W to 30 service. 10W-40 or (God forbid) 40W need to reach some pretty high temperatures in order to flow properly through a machine set for 30W lubricants. (Simplistic explanation...) Stick with the owner's manual. (SAE 40 (diesel) is for Caterpillar and Allis-Chalmers stuff...) Our Olds 455 boat engines run 15W-40 truck oil, loaded at 2600 RPM with less than 10" of vacuum driving an 8 or 9 ton boat all day. A N* can't do that (and last very long).
 

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1996 STS (181,000) Arnott Struts, 245/45/ZR18, 1" Drop -SOLD
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1,589 Posts
I agree with what everyone else is saying: Use 10W-30. I just put Valvoline in and my car runs nice and smooth.
 

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2005 STS4 1SG: GM Acc Lights, Corsa, Platnium Grille, Volant
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15,987 Posts
my moms cars had oil pressure issues
weve been running 20w-50 in it for 2k miles
car lags alot but still runs ok
 

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'93 STS (sold), now looking for a CTS Wagon soon!!
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503 Posts
Sell the oil to someone with a 20 year old truck, they'll love it.

0-30 or 5-30 or 10-30 oil for the North* depending if there is any small oil drips on the garage floor. Syn. or Syn blend.
 

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99 STS
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269 Posts
Yeah strait 40 is bad news, but i run 10w40 cause i live in vegas and at 115 outside 10w40 thins out real nice, especially when youre trying not to get mangled by people doing 70 in a 35 zone.
 

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1996 STS (181,000) Arnott Struts, 245/45/ZR18, 1" Drop -SOLD
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1,589 Posts
Playdrv4me, if that rock star on your avatar lifts that shirt any higher... I don't think we'll see anything. :lol: :kick: :lol:
 

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1996 Cadillac Fleetwood Brougham
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4,414 Posts
No matter what grade you use just use Amsoil for Northstar :p
lol at lbwd's comment :D
 

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'93 STS (sold), now looking for a CTS Wagon soon!!
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503 Posts
I used Amsoil 0-30 in my GMC truck, but got tired looking for the stuff. It's great for protecting the top-end , when starting.
 

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06 CTS-V (sold)
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680 Posts
I used Amsoil 0-30 in my GMC truck, but got tired looking for the stuff. It's great for protecting the top-end , when starting.
Easy to order online. Info in my sig. FYI, AMSOIL Preferred Customer Program members buy at dealer cost, about 25% under retail. Drop me a PM if you are interested in ordering online at dealer cost via this program. :cheers:
 
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