Originally Posted By: dblshock
I'd say a 5.7 Chrysler is a very poor engineering benchmark to argue this point on
I think that was my point in the MDS clatter discussion.
I'm going to start typing slowly now for Billt460...
Per the OP's question, the title of this thread, the manufacturers are going to thinner oils for fuel economy/CO2...period.
Chrysler followed suit.
Chrysler decided to build an MDS system that when the valves are supposed to cycle normally are supplied oil at 3-4psi. When the valves are supposed to be disabled, they bump that up to 15-16psi. This oil pressure is controlled via the MDS solenoids when the oil temperature gets above 120F (about 50Cst give or take on a 5W20).
Chrysler designed the function of the (ridiculous from my perspective as an engineer) MDS system/solenoids that they designed to operate oil their oil of choice...which they chose for economy reasons.
The fact (and Billt460 still hasn't proven it to be a fact with one opinion piece) that it plays up on other viscosities is not proof that they chose 5W20 for its superior MDS function, it's that their silly system is so finicky that it can't really cope in the real world.
Now, per Bill's opinion piece, a question that I don't know the answer to...do any of the SRT-8s have MDS ?
What's the factory fill and recommended viscosity for these engines ?
Why, if not 5W20 is it NOT 5W20 on the high performance engine ?
Is it because that grade has compromises that they don't want on a high performance engine ?
Does the MDS play up from the factory like it WILL according to Billt460 ?
What "damage" are the Chrysler engineers making their customers suffer doing this ?
I'd say a 5.7 Chrysler is a very poor engineering benchmark to argue this point on
I think that was my point in the MDS clatter discussion.
I'm going to start typing slowly now for Billt460...
Per the OP's question, the title of this thread, the manufacturers are going to thinner oils for fuel economy/CO2...period.
Chrysler followed suit.
Chrysler decided to build an MDS system that when the valves are supposed to cycle normally are supplied oil at 3-4psi. When the valves are supposed to be disabled, they bump that up to 15-16psi. This oil pressure is controlled via the MDS solenoids when the oil temperature gets above 120F (about 50Cst give or take on a 5W20).
Chrysler designed the function of the (ridiculous from my perspective as an engineer) MDS system/solenoids that they designed to operate oil their oil of choice...which they chose for economy reasons.
The fact (and Billt460 still hasn't proven it to be a fact with one opinion piece) that it plays up on other viscosities is not proof that they chose 5W20 for its superior MDS function, it's that their silly system is so finicky that it can't really cope in the real world.
Now, per Bill's opinion piece, a question that I don't know the answer to...do any of the SRT-8s have MDS ?
What's the factory fill and recommended viscosity for these engines ?
Why, if not 5W20 is it NOT 5W20 on the high performance engine ?
Is it because that grade has compromises that they don't want on a high performance engine ?
Does the MDS play up from the factory like it WILL according to Billt460 ?
What "damage" are the Chrysler engineers making their customers suffer doing this ?