best oil for engine

[rmb1393]

Now that its fall i want to change my oil and i don't know if just the regular conventional oil will do or if my 2002 7.3l F350 likes to have synthetic run through it. my dad uses synthetic for his 6.4 liter and im just wondering if i should too and what is the best oil for my protection thank you!

[SyN]

If you chose to run regular 15W-40... Any will work fine... The most popular are Rotella-Delvac-Delo-Valvoline-Mystic-Motorcraft all will protect for hundreds of thousands of miles...

If you chose to go with synthetic which is more expensive but will help with those COLD morning start-ups.... Rotella T6 & M1 TDT 5W-40 are easy to find and great oils... Valvoline Extreme Blue 5W-40 has been proven to be a great oil as well.... Amsoil & Schaeffers are also Top Performers... You can't go wrong with any of these...

Now don't over look Rotella T5 Semi-Synthetic 10W-30...Our 7.3L really have a likeing for the 30WT...They always shear the 40WT down to a 30WT but never more...

This all boils down to how anal your are about your expensive investment and your wallet...You really can't pick a bad oil... I do think Viscosity is what effects the 7.3L and 6.0L not the oil itself... Even though many have posted that their motors react differently to certain oils... I know my 7.3L seems to really like the 5W-40 and 10W-30...It's really sluggish with 4gal of 15W-40 in the crankcase...

Good Luck on your Quest!!!

[95dieselsmoke]

Delo is the only oil I will ever use.

[JEL]

For a CT winter your truck would probably like some Rotella T6 5w40 quite a bit, and 15w40 Delo or Rotella in the summer. They are good oils and readily available. IMO the brand of oil (as long as the right weight and CJ-4 rating) is less important than regular oil changes, your truck won't really know the difference, different weights aside of course. The only time I would run an exotic and expensive off-brand oil is if I was racing or making a ton of power in my truck, for the other 99% of us the big brands work perfectly.

[Nitro41]

Rotella T6 synthetic has helped my cold starts alot.

I go 8,000 miles between changes with a motorcraft filter. I think thats a little too long for that quality of filter, but I will be doin oil analysis coming up.

[Galaxie]

Jump down to a 5 for the cold and syn. No need for a 15w in your 7.3. T6 is affordable and can be found just about any place.

I run it year round in all diesels... Its still a 40 weight when warm.

[Galaxie]

Originally Posted by Nitro41

Rotella T6 synthetic has helped my cold starts alot.

I go 8,000 miles between changes with a motorcraft filter. I think thats a little too long for that quality of filter, but I will be doin oil analysis coming up.

Hum..... I bet a 7.3 wouldnt have an issue getting 7/8k out of that oil.

Can you pust up your analysis when you are done?

[bob harris]

PENRITE 15W - 50 DOWN HERE IN AUSTRALIA DOES ALL YEAR

[SyN]

Andy @ Rev-X told me they have had the best results with Delo... I can't find Delo 5W-40 around here and the Delo 15W-40 really made my 7.3L run and idle like it had vaccum leak... sluggish and would just shake like crazy @ start up.... After about 20 min of driving it would react somewhat normal... It never reacted this way with Delvac or Rotella... Since I have found the right combo for both summer and winter use...

[rmb1393]

so rotella is fine? i've heard mixed opinions on rotella. thank you all for your time and for the advice posted it will be very helpful in the next week