Originally Posted By: MrHorspwer
Originally Posted By: pwr2tow
Now since we have dispelled MDS will be hurt which I knew all along but thought we better go through all the formalities first to get to this point.
I don't think anybody is saying that this will physically hurt the MDS system. Running a heavier oil may very well set a DTC (P1521 if you're interested). It won't turn on the MIL, but it may lead to some odd driveability symptoms during MDS activation. P1521 does not explicity preclude MDS from operating, so it will likely still operate if you stick with a xW30 oil, but it may feel different as the schedule is modified to account for the heavier oil. Step to a xW40 or XW50, I think you'd see a larger impact on the MDS, possibly leading to an actual MDS DTC (P34xx) and a MIL.
Given some of the emperical data available from fleets, particularly police fleets, who use 5W20 in both Crown Vics and Dodge Chargers, I'd say a quality 5W20 will suit you just fine.
Thank you for some techincal insight theories on the MDS system. Kudos to you sir.
Thank you for your reply and insight from other severe service users. I never doubted the 20 weight oil and have actually read some very convincing data and theories over the last year or two to support the volidaty of using lower weight oils. Was just curious if there was any supporting data for using a heavier weight at full operating tempertures in severe driving conditions on a 20 weight speced engine.
Thanks again,
Ron