Switch to Synthetic

[JohnnyR]

Have about 58,000 mi. on the 2003 GMC Duramax I bought in Feb., 2003. Have run Shell 15W-40 Rotella T conventional oil up to now, but considering switching to Amsoil synthetic 15W-40.

Experienced a leaking seal recently when I switched from conventional to synthetic on an older (1979) motorcycle. I'm thinking the old '79 seals weren't up to synthetic.

Anybody think I may have waited too long on the Duramax to switch and may suffer leaksas well?

Thanks in advance for your input.

[DmaxMaverick]

Just do it. Your truck will love you for it. There should be no problems.

[Jim Brzozowski]

Johnny R, all of the seals are good with synthetic lubricants, if they were otherwise, I would already know since I run all synthetics except brake fluid and coolant of course.

[Bridgeman]

Johny R, Synthetic is the way to go by why not stay with the Shell? The Rotella T 5W-40S or the 0W-40SB for the extreme Northern temp differential.

[Tough Guy]

I run the Rotella T 5w-40 synthetic and love it. I get it at Wal-mart for ~$13.00 a gallon.

Cheers