First of all, new to Diesel engines. Have a 06 f350 with 158000 miles on her. Would it hurt if I put a amsoil, rp, or any brand of synthetic in it at this time without causing something bad?

 

Using synth will not hurt your 6.0

 

In my opinion synthetic will be better for it.

 

X2.....add Archoil too! Use Motorcraft filters

 

You can save money buying racor oil and fuel filters, donadson air and ntz external tranny filters on line at dieselfiltersonline.com.

 

If it has been given regular oil changes, 158,000mi. is NOT high mileage for a diesel. However, my personal feeling is stay with what has given you good service.

 

ive never understood the reason to go synthetic on the 6.0 when I change the oil every 5k miles. I use Rotella 15W-40 and call it good. I put Archoil in occasionally if needed. Mine is at 224k miles. To each his own I guess

 

Can't bash synthetic if you haven't run it in your truck

 

Actually a lot cheaper to order oil/fuel filters at Advance Auto and use the coupon code, order the trans filter thru eBay.

Josh

 

Thanks for all the replys and helpful tips for online deals. Time to get dirty!

 

I use Rotella T6 5W-40 because the truck starts a lot better in the winter with it. I don't drive a lot of miles so I just run it year round.