Oil Recommedation
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Oil Recommedation
First off since this is my first post I will say hello from Bremerton, WA. So here's the story, just bought a '93 F-150 4X4, 4.9l in-line-6, 5sp manual, 200k miles. Same owner since '94 and has been well maintained. My question is which oil should I be using? After searching around here and BITOG I have narrowed it down to: Rotella T6 5W-40, Rotella 15W-40 dino, and Delo 400 15W-40. My concerns would be:
-Is 15W-40 okay to use here in the NW? We get down in the 20’s maybe a handful of nights in the winter
-Is it okay or even recommend switching to synthetic after the truck has only had dino for all of its 200k miles?
Thanks for the help and feel free to recommend other oils that might be better than these three.
-Is 15W-40 okay to use here in the NW? We get down in the 20’s maybe a handful of nights in the winter
-Is it okay or even recommend switching to synthetic after the truck has only had dino for all of its 200k miles?
Thanks for the help and feel free to recommend other oils that might be better than these three.
Post Fiend
Joined: Jun 2001
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From: Running Springs CA
Welcome to FTE and the Oil and Lubrication Forum!
Delo 400 is my favorite for older engines. Since 15w is good down to +4F according to SAE J300, and I have used it up here in the mountains with winter morning temperatures frequently in the 20's, I see no problem. Rotella T6 5W-40 may increase gas mileage for short trips and it is my favorite motorcycle oil. While it is not PAO and wont harm seals, syn tends to find small leaks and amplifies them.
Jim
Delo 400 is my favorite for older engines. Since 15w is good down to +4F according to SAE J300, and I have used it up here in the mountains with winter morning temperatures frequently in the 20's, I see no problem. Rotella T6 5W-40 may increase gas mileage for short trips and it is my favorite motorcycle oil. While it is not PAO and wont harm seals, syn tends to find small leaks and amplifies them.
Jim
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
The LE version of Delo 400 still has 1200ppm zinc so I dont know what all the fuss is about. What has been reduced is TBN (total base number), a non-issue in gasoline engines and really a non-issue for any on-road diesel, due to the ultra low sulfur content of fuel today. Moly is the reason I prefer Delo over Rotella in everything except motorcycles with wet clutches.
Post Fiend
Joined: Jun 2001
Posts: 5,228
Likes: 5
From: Running Springs CA
Molybdenum trialkyldithiocarbamate (MoTDC) is another extreme pressure lubricant, similar to ZDDP in that it prevents metal-to-metal direct contact when the hydrodynamic oil film is squeezed out. Upper piston rings are coated with Moly compounds and now Honda even coats piston skirts with it. Delo 400 is too "slippery" for wet motorcycle clutches, while Rotella is approved for Japanese motorcycles (JASO MA) due to lack of Moly. To me, thats a good thing in all other gasoline and diesel engines. ZDDP somehow does not change frictional properties, but acts only as an EP lube and antioxidant.
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