I just had my slant six rebuilt and I'am about to drop it back into my 1982 D-150. This might be a dumb question but I don't know what kind of oil to use. I was putting 10w-30 in it before I had it rebuilt. Do I just use the same oil?

That'll work.

Non syn for breakin

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Do you need break in instructions, or did your builder supply you with that information?

CJ

I use Shell Rotella T 15-40 for break in, and at every oil change. It has all the good stuff that you need with a solid lifter motor. The newer synthetics are okay AFTER break in, but to be safe i would use some oil additive that you can buy from comp cams

I would use 10-30 Rotella. 15-40 is OK for summer. 15-40 Valvoline diesel in my van makes noise in the TN winter until it warms up.


Too thick causes loss of MPG.

One thing for sure diesel lube will keep the insides clean!

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

The machine shop that did my rebuild said they would not warranty the motor unless I used Kendal brand (diesel oil). It is very common up here and is similar to Rotella. So I followed their advice for the 20 minute 2,000 rpm break in procedure. After that I switched to 10-30 Valvoline for the next few months while the rings seated, then made the switch to 0-30W Mobile 1. Wow! what an oil!
The engine runs super quiet and gets incredibly fast oil pressure with a stock pump. Two seconds after start up I see 50 lbs. on the gauge.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Are you using that 0W-30 in the summer time and if so, how hot does it usually get where you are?

Right now I'm useing a 10W-30 in mine and after a pretty hard run on the freeway, I'll still be at 50psi of oil pressure at an idel. I'm at 60-65 crusin' down the road.

I'm thinking on going to a 5W-30 to take a little of the pressure off of things...

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Phil Hudlow 6678 S/C, S/G, ET

These recommendations are okeh for an engine in reasonable but moderately-worn condition. They are unjustifiably thick for a newly-rebuilt engine. Use 5w-30!

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

That kind of requirement is illegal under the U.S. Magnuson-Moss Warranty Act unless the machine shop provides you with Kendall oil free of charge.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Dan, Yes, they filled the crank case and pre-lashed the valves for start up. I just had to add another quart once it was in the car.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Hudlow6678,
Where we live against the foot hills it gets 85 to 95 quite often in the summer and occasionally a 100 for a week or so. In Seattle it might only get 75 or 80 degrees.

Dan suggested that I try 5-30W Mobil 1 in the summer which I have done but, there is something unique about the 0-30W Mobil 1. I am not sure what they do to the oil, but the engine really likes it year round. :shrug:
It runs cooler, quieter and has higher oil pressure quicker during the morning start ups and after heat soak. Plus the engine gets a little better mileage. I am thinking of just staying with the 0-30W Mobil 1.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

No reason not to use 0W30 year round if your engine develops good oil pressure with it.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

The viscosity of 30-weight oils (0W-30, 5W-30, 10W-30, 30) is all in the same range (9.3 - 12.5 cSt) at operating temperature (100°C). Lower W-grades (cold viscosity rating) are thinner compared to higher W-grades when the engine is cold. Therefore, your engine should have about the same hot oil pressure no matter which 30-weight oil you use.

Generally, a 0W-30 oil will maintain its hot viscosity better than a 10W-30 or straight SAE 30 because it of its higher viscosity index.

Engine Oil Article