Oh No!! Not another oil thread?!

[RRaulston]

So i have no idea when/if my trans oil has ever been changed. Based on color, I'm pretty sure its 15-40 motor oil. I will be changing it to Syn ATF when I get an extra $700 bucks, but for now, would the Costco HD 15-40 Diesel motor oil be sufficient?? It's the cheapest 15-40 I can find at 13.33 a gallon!? Thanks....

 

[simp5782]

So i have no idea when/if my trans oil has ever been changed. Based on color, I'm pretty sure its 15-40 motor oil. I will be changing it to Syn ATF when I get an extra $700 bucks, but for now, would the Costco HD 15-40 Diesel motor oil be sufficient?? It's the cheapest 15-40 I can find at 13.33 a gallon!? Thanks....

Yes its fine. You can use any type of oil in it really. Doesn't matter.



Check ebay for BG products transynd. You can find it for $20/25 gal at times comes in 4gal boxes.

 

[tennmogger]

Suggestion, if the "oil" looks ok, run it. Draw a sample (petcock provided for that purpose mid-engine right side frame) and have it tested (I like Blackstone). Test will probably show good to go. Saved yourself hundreds$$ !!

I run one LMTV with synthetic trans lube because it was my first truck and 'experts' said it should be changed. Three other trucks still have the 15W40 oil and I can hardly tell the difference in shifting. I have no intention of changing to synthetic trans lube again.

Testing applies to engine oil too.

 

[simp5782]

Suggestion, if the "oil" looks ok, run it. Draw a sample (petcock provided for that purpose mid-engine right side frame) and have it tested (I like Blackstone). Test will probably show good to go. Saved yourself hundreds$$ !!

I run one LMTV with synthetic trans lube because it was my first truck and 'experts' said it should be changed. Three other trucks still have the 15W40 oil and I can hardly tell the difference in shifting. I have no intention of changing to synthetic trans lube again.

Testing applies to engine oil too.

If it is running miles then I suggest Transynd. That is the only benefit you get is then. It's good for 100k or more miles where as the engine oil is 15,000mi under severe conditions, 20 to 30k under normal conditions.

With the labor, oil involved with 3 services vs 1 it all equals out.

You will get cooler Temps with transynd if you use an air cooler and bypass the heat exchanger for summer months.