This topic is probably old but what is a good oil. i bought a used 2004 CTD and dont know what the customer was putting in it? How can i tell if he was using synthetic? or would it matter if i used synthetic or not? If so which rating? 15w40? or just use normal rotella or petro canada 15w40. has anyone heard of using CO-OP dmo 15w40 or Boss Lubricants 15w40? Which is a good oil and fuel filter to use? fram or amsoil? I havent really checked good under hood but where exactly is fuel filter and oil filter located?

 

I use amsoil it seems to be pretty good,i change every 10 to 12 thous. I also have used synthetic rotella 5-40 was excellent in winter could really see the oil pres increase as it warmed up its about the only oil i have seen the pressure go up after warmup instead of loosing pres as it heated up

 

My self I use Amsoil 5w30 HDD oil year round. But not knowing what the other owner used or how many miles are on your engine I would go with one of these oils, Chevron Delo 400, Valvoline Cummins Blue, Mobile Delvac or Exxon HD. My self I tried the Rotella 5w40 oil and was not very happy with it so I can not recomend it.

 

I'm using regular ole Rotella T with no problems that I know of. Been using it since the truck was born.

 

Do you use any stabilizer like Lucas or oil additive with it? I have have been using synthetic since 16years old, I know about break in with the ctd but for some reason just feel more confortable with synthetic.

 

delo 400 is what I used before I switched over to Amsoil.

if you can get on the prefered customer program you can get some good discounts

 

Naah .... just regular ole Rotella. No addtives or anything else, just Rotella. I religiously change it every 5000 miles though. I'd do that regardless of which oil I used though.

 

Ditto the preferred customer deals on Amsoil. Makes them competitive with other synthetics and they are supposed to be the best anyways. I've got a case of MTG and ATF. I need some gear lube and eventually some engine oil too after my truck is broken in. Gonna run a bypass filter too.