99 Oldsmobile LSS supercharged oil recommendations

[ls1mike]

Having owned 4 3800 powered cars.

1998 Bonneville N/A
2001 Grand Prix GTP
1998 Buick Regal GS
and the current 04 Grand Prix.

I can tell you, you don't need a high mileage oil. The seals are not cork. The can't expand when the are bad they are bad.
You will most likely at some point have to do the valve cover gaskets and perhaps the oil pan gasket.

Run a good quality 10W30. I put 270,000 on my 01 Grand Prix with Mobil 1 10W30
280,000 on the Bonneville with Castrol GTX 10W30

The Regal now has 170,000 and has had Mobil one since 52,000. I did have to do the oil pan gasket in that car.

I have Mobil 1 in the Grand Prix just run a good quality dino oil.

and oh you need this.

ZZPerformance Stage 1 kit

 

[ag_ghost]

Assuming you use an API-labeled quality oil (i.e., avoiding some of the lousy oil sometimes found by PQIA, the answer to your question is 'no'. There's nothing bad about HM oil. That being said, are there symptoms leading you to consider it; i.e., unacceptable leakage/oil consumption? 137,000 miles in a '99 model car doesn't seem that big of a deal imho.
Kevin

 

[Branson304]

That's what I was thinking too. Since you're supercharged I would use at least a blend.

 

[CARGUY40]

how about mobil 1 high mileage 10w40 full syn? Oh and i know of zzp thing is i dont see anything listed for oldsmobile on there site?

 

[barkingspider]

U can use HM oil, won't hurt but not required. I like rotella t5 10w30 for ur car.

 

[Jimzz]

Originally Posted By: Branson304


Otherwise, Valvoline MaxLife Synthetic Blend is pretty much the best high mileage oil on the market. My Fusion loves it & I've seen a couple other vehicles that do great on it as well.


That's a good oil and will work well. I would try a 10w30 first, should work well.

 

[bullwinkle]

Originally Posted By: Jimzz
Originally Posted By: Branson304


Otherwise, Valvoline MaxLife Synthetic Blend is pretty much the best high mileage oil on the market. My Fusion loves it & I've seen a couple other vehicles that do great on it as well.


That's a good oil and will work well. I would try a 10w30 first, should work well.
Look at Wal-Mart, they've had a great price on the 10W30 MaxLife full synthetic-$18.18 for a 5 qt. jug, & a $10 off coupon on 2 jugs.

 

[The motor guy]

Originally Posted By: boostedtsiawd
Hey guys im wondering should i use a high mileage oil for my car since it has 137k miles? is there anything bad about high mileage oil?

1999 oldsmobile lss supercharged


137 isn't high miles I'd keep using a regular Pennzoil 5w30 until the car dies. Fix whatever leaks develop instead of using thicker oil or something dumb like that. Doesn't have to be Pennzoil either.

 

[CARGUY40]

im not sure if its leaking oil or not i just bought it i just figured cause it has 137k i should run a high mileage oil but its also supercharged and i heard synthetic is the best to run in supercharged or turbo charged engines.

 

[Tdbo]

Unless it is using or leaking oil, no.

 

[Dyusik]

Hm oil has better add packs thst I've seen.

 

[lubricatosaurus]

You could get by OK with non-HM oils on an old engine like that, but why take a chance?

"Seal swell additives help to maintain the integrity of certain elastomeric materials used as seals, preventing elastomer shrinkage, brittleness and deterioration during service."
http://www.aftonchemical.com/Solutions/LubricantComponents/Pages/SealSwellAdditives.aspx

https://en.wikipedia.org/wiki/Oil_additive

 

[sciphi]

That L67 V6 will last a long time on regular old 10w-30. Change it regularly, run premium fuel, and it'll keep giving you a good time when the rest of the car is junkyard fodder.

The supercharger is completely separate from the engine oil system on that car. It's not like a turbo that depends on the engine oil supply. It uses its own oil. Change that oil with the GM-recommended stuff, try not to barf at the smell, and keep the engine oil changed regularly.

 

[gallydif]

Originally Posted By: sciphi
That L67 V6 will last a long time on regular old 10w-30. Change it regularly, run premium fuel, and it'll keep giving you a good time when the rest of the car is junkyard fodder.

The supercharger is completely separate from the engine oil system on that car. It's not like a turbo that depends on the engine oil supply. It uses its own oil. Change that oil with the GM-recommended stuff, try not to barf at the smell, and keep the engine oil changed regularly.
Yes. Except for the premium fuel. No need for that.

{removed youtube video due to profanity in comments. Embed the videos!}

 

[gallydif]

Originally Posted By: boostedtsiawd
Hey guys im wondering should i use a high mileage oil for my car since it has 137k miles? is there anything bad about high mileage oil?

1999 oldsmobile lss supercharged

No need to use high mileage unless your car burns oil and you find yourself topping it off.

 

[ls1mike]

Originally Posted By: gallydif
Originally Posted By: sciphi
That L67 V6 will last a long time on regular old 10w-30. Change it regularly, run premium fuel, and it'll keep giving you a good time when the rest of the car is junkyard fodder.

The supercharger is completely separate from the engine oil system on that car. It's not like a turbo that depends on the engine oil supply. It uses its own oil. Change that oil with the GM-recommended stuff, try not to barf at the smell, and keep the engine oil changed regularly.
Yes. Except for the premium fuel. No need for that.


Wrong supercharged 3800s are prone to spark knock/detonation with anything less than 91 Octane. They are tuned from the factory to run on 91. They pull the timing WAY back on the cheap stuff. It hurts the cars performance, the cars gas mileage and has the possibility of causing damage while under boost at WOT. I been around them long enough to have see it first hand with data logging.

 

[CARGUY40]

well i just bought mobil super high mileage 10w30 is that ok or i should stick to conventional? its a syn blend. I dunno i just heard alot saying go with a syn blend or full syn since its more of a sporty car cause its supercharged....

 

[CARGUY40]

high mileage oil is for vehicles over 75k miles mine has 137k....

 

[Justin251]

Mobil super high mileage is great and a synthetic blend.

 

[Shannow]

I've got a couple of 10W30 semis lined up for mine next few OCIS (both are A3/B4), and will settle on 5W30 A3/B4 for both my vehicles after I use those up.