I'm going to be changing the oil in my slant quite frequently in the next month or so. to get some sludge out and what not. I'm wondering what weight should I be running? Right now 15w-40 diesel is in it...but thats a wee bit expensive for me to be running for a short period, changing, short period, etc. I'm looking for what i should just go buy a case of.

Thanks
-Mike

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Daily Driver 72 'Cuda
74 Duster /6
http:www.goodysgotacuda.com

How cold is it where you are?

How many miles on the engine?




I use 10w-30 with low miles and I'm in Los Angeles. Temp and miles are a determining factor...........

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

I'm in vegas, so right now its about the same as you. And its about 120k miles. Thanx

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Daily Driver 72 'Cuda
74 Duster /6
http:www.goodysgotacuda.com

10W30 should be fine, you might go to 10w40 in the summer, especially if you spend a lot of time in traffic.

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David Kight
'62 Valiant Signet, White
'98 Dodge Dakota
'06 Jeep Liberty

Growing older is unavoidable but growing up is strictly optional.

...can't beat good ole Valvoline SAE 30, unless it's cold where you live.

D/W

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If it ain't broke, fix it!

In Vegas, you'd be fine with SAE 30 pretty much year round. 10w30 if you will need to start the engine regularly at temperatures below 40°F.

10w40 is never adviseable.

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

Ok, well im not sure if i mentioned this above. But the motor has been off the road since 1986. I just got it fired a few days ago, smokes pretty well. So i dont think i really want the thinnest oil in there right now. 10w-30 doesnt sound too bad for now while im putting some atf in, changing it very often, etc.

-Mike

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Daily Driver 72 'Cuda
74 Duster /6
http:www.goodysgotacuda.com

Then SAE 30 is your oil.

D/W

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If it ain't broke, fix it!

How frequently are you planning to change it? And at what point do you intend to stop?

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The Old Goat '83 D150 225-2

AKA Ice Titan

ususally i agree with you dan, but driving in Vegas sure would make an oil that's a little thicker advisable.

i live in San Antonio and i run 20/50 in everthing. motorcycle, slant, V8s lawnmower. all i know is that after 312000 miles my dakota is still going strong, my dad's truck has 175K and doesn't use oil or have oil pressure issues, my Jeep came back from the dead because of a motor clean out and flush and some 20/50 (PO used 10/30 and it had low oil pressure),my mother's Festiva has 200+K miles on it and no issues.

in my dad's shop we've quieted down noisy lifters and gotten people down the road w/20/50 when they had issues with thinner oils. 5/30 for example.

i know its not any kind of a study, but my experience tells me differently than to advise thin oils.

just my .02

sb

No debate there. I don't object to thicker oil, it's 10w40 specifically that's never a good idea. That particular grade of oil has the least amount of actual oil and the largest amount of polymeric VI-modifier chemistry in it, which makes it the grade of oil that is the most prone to sludging and coking, with the worst viscosity maintenance, of any common oil viscosity grade.

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

I follow my oil change procedures and intervals very closely and I have noticed that 10W-40 Quakerstate doesn't sludge very much at all. I pulled the valve cover off of my D-150 not too long ago and it is as clean as a whistle.

10W40 Castrol however, that is a sorry oil. It clogged up the lifters in my Fifth Avenue.

It is so hot & humid down here in Georgia I am afraid to run 10W-30 in my slant.

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82 D150-225/727
02 Dakota-3.9/5 speed
87 GMC C7000-8.2 Detroit Diesel/5+2