Oil Pump Prime Question
Le Mans Master
Joined: Apr 2011
Posts: 6,284
Likes: 1,171
From: Hermosa
All my combustion engines get Mobil 1 0W-40 European Formula only...this weight of Mobil 1 is a Group IV based synthetic, unlike the other weights of Mobil 1 that are called "synthetics".
However in my modern cars with VVT I use the recommended oil and weight. These engines use oil flow and pressure to vary the valve timing.
I can't say for certain but modifying the oil viscosity seems to me may also alter the response of the VVT system since it uses oil pressure and flow to vary said timing.
This what one fellow has to say about it;
http://www.underhoodservice.com/oil-...s-vvt-engines/
I kinda wonder if these VVT systems are especially sensitive to SAE viscosity or not. Certainly the flow rate changes drastically with temperature but computer programming could account for these changes looking for a certain range of operation before utilizing the VVT during operation.
On your vehicles with VVT have you noted any difference in fuel economy or performance by using 0w40 vs perhaps a 0w20 or 5w20 oil recommended by the manufacturer?
Last edited by REELAV8R; Oct 29, 2017 at 11:42 AM.
Le Mans Master
Joined: Oct 2007
Posts: 7,445
Likes: 971
From: Tennessee/Rhode Island
We are in agreement on the use of the 0w40 oil. It's the only oil I use in the corvette.
However in my modern cars with VVT I use the recommended oil and weight. These engines use oil flow and pressure to vary the valve timing.
I can't say for certain but modifying the oil viscosity seems to me may also alter the response of the VVT system since it uses oil pressure and flow to vary said timing.
This what one fellow has to say about it;
http://www.underhoodservice.com/oil-...s-vvt-engines/
I kinda wonder if these VVT systems are especially sensitive to SAE viscosity or not. Certainly the flow rate changes drastically with temperature but computer programming could account for these changes looking for a certain range of operation before utilizing the VVT during operation.
On your vehicles with VVT have you noted any difference in fuel economy or performance by using 0w40 vs perhaps a 0w20 or 5w20 oil recommended by the manufacturer?
However in my modern cars with VVT I use the recommended oil and weight. These engines use oil flow and pressure to vary the valve timing.
I can't say for certain but modifying the oil viscosity seems to me may also alter the response of the VVT system since it uses oil pressure and flow to vary said timing.
This what one fellow has to say about it;
http://www.underhoodservice.com/oil-...s-vvt-engines/
I kinda wonder if these VVT systems are especially sensitive to SAE viscosity or not. Certainly the flow rate changes drastically with temperature but computer programming could account for these changes looking for a certain range of operation before utilizing the VVT during operation.
On your vehicles with VVT have you noted any difference in fuel economy or performance by using 0w40 vs perhaps a 0w20 or 5w20 oil recommended by the manufacturer?
