lowbuckx Posted November 21, 2010 Report Share Posted November 21, 2010 Had my 100K mile oil change a week ago. Besides trying to sell me $700 service package I have a strange problem. ($200 parts rest labor ) My truck always runs 40 PSi at highway speeds and gets 18-20 MPG (non SS 5.3 2003 ext) Now at freeway speeds Im nearing 50 psi and 15-16 MPG No other change was made and the shift started the moment I left dealer.... No SES light same gas as always and a few tanks ran through... I questioned dealer and they said I need that $700 service to fix? Im thinking they used some thick oil and thought they were screwing someone that wouldnt put 2 and 2 together... What do you think,. PS this same dealer painted over rust and flaking paint and used Zip ties to reattach the front bumper Valance.... Yes I didnt notice till well after I got it home.... My fault for not having a fine enough comb to search but this Oil change buisness is killing me... Quote Link to comment Share on other sites More sharing options...
Ruben525 Posted November 21, 2010 Report Share Posted November 21, 2010 Damn sounds like it's time to find a new dealer Quote Link to comment Share on other sites More sharing options...
lowbuckx Posted November 21, 2010 Author Report Share Posted November 21, 2010 Damn sounds like it's time to find a new dealer Im back to doing my own work for sure Quote Link to comment Share on other sites More sharing options...
silverado_ss_04 Posted November 21, 2010 Report Share Posted November 21, 2010 Im back to doing my own work for sure Quote Link to comment Share on other sites More sharing options...
1BAD2K Posted November 21, 2010 Report Share Posted November 21, 2010 sounds odd to me but the 50 psi is a good thing. mightve used some thicker oil???? The lower mpg blows though. might be related ot if they did use higher viscosity oil. Quote Link to comment Share on other sites More sharing options...
lowbuckx Posted November 21, 2010 Author Report Share Posted November 21, 2010 sounds odd to me but the 50 psi is a good thing. mightve used some thicker oil???? The lower mpg blows though. might be related ot if they did use higher viscosity oil. I have to disagree on the oil pressure. Higher doenst mean better. The old 10 PSi per 1000 RPM is not the rule anymore. 5 psi at idle with a 55 PSI max is good on aGen 1 small block with moddern Oil and clearances. Gen 3 small blocks are inline with this. Heck some prostock motors run 0 PSI idle and top out at 12 PSI and last entire seasons. I feel power is down a bit also. I have a case of 5-30 Royal Purple sitting on the shelf for next oil change.. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.