Thick oil wanted for 1991 4.3L GM V6

[Vitamin Yoda]

Summer time Kohler motor oil !

It works just fine in winter. Most trucks in the US run 15W-40 in Winter, and some run even cheaper stuff than Delvac 1300.

 

[4WD]

It works just fine in winter. Most trucks in the US run 15W-40 in Winter, and some run even cheaper stuff than Delvac 1300.

View attachment 202784

I change twice a year and have some old PPE 0W40 I use during
“leaf season”

 

[ripcord]

Overthinking this

This is BITOG, that's what we do, LOL.

 

[nascarnation]

How much oil do you burn in 1000 Miles of Driving?

If it's excessive, it's not too difficult on these to throw in a fresh set of valve stem seals. 15 bucks or so for the parts and you don't have to remove the heads. Check YT for some useful vids.

 

[Chris142]

Just get 20w50 or sae 40

 

[Vitamin Yoda]

If it's excessive, it's not too difficult on these to throw in a fresh set of valve stem seals. 15 bucks or so for the parts and you don't have to remove the heads. Check YT for some useful vids.

Valve guides are about $7 a piece, and I can see hoe the wear out. I'm sure the OP has considered replacing them, and decided against it.

 

[4WD]

This is BITOG, that's what we do, LOL.

BITOCD guy

 

[Brian123]

If it's excessive, it's not too difficult on these to throw in a fresh set of valve stem seals. 15 bucks or so for the parts and you don't have to remove the heads. Check YT for some useful vids.

The OP did have his Valve Stem Seals replaced!

 

[addyguy]

If it goes through a lot of oil, and the cheapest is what you want, your best price will be on a pail of 15W-40 that is on sale.
Some house-brand 15W-40 pail.

 

[sloinker]

Maybe a 55 gallon drum of this magic potion? j/k

Heavy Duty Oil Stabilizer – Lucas Oil Products, Inc. – Keep That Engine Alive!

www.lucasoil.com

 

[nascarnation]

The OP did have his Valve Stem Seals replaced!

Yes and the mechanic told him the guides were worn. Seals wear faster with loose valves. But you have to pull the heads to do a guide job where you can do the seals with the heads on. If he's not burning too much oil, I'd just run it and observe the old "check oil each gas fillup" maxim.

 

[Brian123]

Yes and the mechanic told him the guides were worn. Seals wear faster with loose valves. But you have to pull the heads to do a guide job where you can do the seals with the heads on. If he's not burning too much oil, I'd just run it and observe the old "check oil each gas fillup" maxim.

Amazing that an Engine with 86K on it would have the Valve Guides worn!

 

[nascarnation]

Amazing that an Engine with 86K on it would have the Valve Guides worn

Not that long ago 100,000 miles was considered "useful life" for a passenger car and the odometers were 5 digits plus tenths. Also you get into production variation in the carbon content/hardness of the cast iron material. Foundry processes have come a long way.
My 67 Chevy 250 six had 14 thousands cylinder bore wear at 40,000 miles.

 

[Brian123]

Not that long ago 100,000 miles was considered "useful life" for a passenger car and the odometers were 5 digits plus tenths. Also you get into production variation in the carbon content/hardness of the cast iron material. Foundry processes have come a long way.
My 67 Chevy 250 six had 14 thousands cylinder bore wear at 40,000 miles.

Great Discussion, so glad that I went from:

1) Valvoline
2) Castrol GTX
3) Mobil 1
4) Pennzoil Platinum

The 67 Chevy that you had, can you give us a story on this vehicle, because there is more to life than Motor Oil, except here on Bitog?

 

[CheezWhiz]

Would this be to expensive?

$22.97 per 5 quart jug. It used to be $18.97, but inflation happened. It uses GTL base stock, so it's actually really high quality oil.

View attachment 202756

what are the zinc and phosphorus numbers on that stuff?

 

[Vitamin Yoda]

what are the zinc and phosphorus numbers on that stuff?

Virgin sample? Around 1000 P/1100 Zn. VOAs show it lower, then again, most of them aren't very accurate. However, that's the spec for the Infineum add-pack used by Shell for this lubricant at the recommended treat rate to meet the approvals and specs. The majority base stock is GTL, no Group III or III+ is used in this oil.

 

[nascarnation]

Great Discussion, so glad that I went from:

1) Valvoline
2) Castrol GTX
3) Mobil 1
4) Pennzoil Platinum

The 67 Chevy that you had, can you give us a story on this vehicle, because there is more to life than Motor Oil, except here on Bitog?

I bought it in 2001. 67 convertible, 250 six with Powerglide. It had been sitting for over 20 years but had only accumulated 37000 total miles. Ran great but had a lot of piston slap noise (given the serious bore wear, that was no surprise after I took the engine apart LOL). I did a complete restoration after I retired in 2009, took me three years.

 

[otis24]

Probably burning about a quart per month. The valve stem seals were replaced. That’s how the mechanic knew the valve guides were bad. I would guess the truck has about 145k miles. My school purchased it in 1995 with 56k miles. They put about 1200 miles per year on it. Oil changes were once per year. I purchased it with 86k miles. I put about 6k miles per year on it.

 

[wlk]

QS Allmileage has a cheaper 10w40 at wallyworld might be worth a shot

 

[otis24]

Would this be to expensive?

$22.97 per 5 quart jug. It used to be $18.97, but inflation happened. It uses GTL base stock, so it's actually really high quality oil.

View attachment 202756

If I can find it, I would definitely run that. I will look for it!