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This is a quick question related to a previous post. My perkins t6.3544 has multiple different oils reccomend, currently I'm using 15w 40 but some sites say I should use strait 30 weight. What do you think is better? Both are listed in the manual as ones to be used.
 

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Go by the manual

This is a quick question related to a previous post. My perkins t6.3544 has multiple different oils reccomend, currently I'm using 15w 40 but some sites say I should use strait 30 weight. What do you think is better? Both are listed in the manual as ones to be used.
If in doubt, go by the manual but check to see if there's an update on the mfg. website. Usually if more than one oil is recommended, there's some criteria related to temperature or type of use. Of course, Perkins recommends using their oil: "Perkins approves and recommends Perkins Engine Oil 15W-40 API CI-4 as the only oil to use in Perkins engines, EU Stage IIIA/U.S. EPA Tier 3 equivalent and below."

Engines benefit from good quality oil | Perkins Engines

If Perkins oil is cost competitive, I'd usetheir oil. If it's way out of line, I'd use a good quality 15W-40 API CI-4 oil. Rotella T-4 meets that spec as do other good brands.

Treefarmer
 

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Treefarmer hit the nail on the head. The manual or newer available online direction should give you a temp chart that reflects the preferred oil. In cooler/cold weather I’d expect it to go the 30wt route, in hot weather I’d expect it to indicate that the 15w40 is preferable.
 

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Hi All
Please remember that the perkins 6-354 dates from the 1950's, multi grade oils were not around. The above link is for modern engines, it also says to use only perkins oil in tier 3 and below, it could be specially formulated to run in the older engines. I would contact perkins and check. My experience is that they now best and the result of using the recommended oil made a great difference to my engine.
Regards John
 

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Hi All
Please remember that the perkins 6-354 dates from the 1950's, multi grade oils were not around. The above link is for modern engines, it also says to use only perkins oil in tier 3 and below, it could be specially formulated to run in the older engines. I would contact perkins and check. My experience is that they now best and the result of using the recommended oil made a great difference to my engine.
Regards John
While I agree that the older vintage of this engine was designed and intended to run on oils of its era, finding them now to run in it would be like the proverbial needle in the haystack at best. Even if one could find a matching era lube, would it be suitable to run in any application at this point, who knows what its properties are now after almost 70 years of unknown condition storage...

Best bet is to take the advice of the manufacture and perhaps find a modern lube that is directly backward compatible with the original.
 

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While I agree that the older vintage of this engine was designed and intended to run on oils of its era, finding them now to run in it would be like the proverbial needle in the haystack at best. Even if one could find a matching era lube, would it be suitable to run in any application at this point, who knows what its properties are now after almost 70 years of unknown condition storage...

Best bet is to take the advice of the manufacture and perhaps find a modern lube that is directly backward compatible with the original.
As I said check with Perkins. They advised me to use Delvac 1330 in my 6-3542 and Mobil Delvac 1330 is available according to the Mobil website.
regards John
 

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Discussion Starter #7
I decided to try 20w 50 which was listed as an option. I also added some Lucas oil stabilizer, between the 2 it seems to have helped a substantial amount. All Is good now
 
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