Oil pressure reads high when cold?
Cold oil is thicker, so it will show higher pressure as its pumping, it will come down as the engine warms up but high pressure when its cold is normal.
There is thermostat bypass for the oil cooler so it won't be open all the time in cold weather.
Our oiling systems do have higher pressure than I'd see in other cars, but this is all normal.
There is thermostat bypass for the oil cooler so it won't be open all the time in cold weather.
Our oiling systems do have higher pressure than I'd see in other cars, but this is all normal.
One of the few weaknesses 4G63 is its rising oil temperature. The Evo uses a thermo switch that circulates the oil to the cooler when the temperature gets around 85C. When the oil temp is low, it will restrict oil flow to the oil cooler and raise the temperature of oil consequently. TOMEI oil thermo killer allows the oil to flow into the oil cooler constantly regardless of its temperature. Still, it is easy to put it back to stock thermo switch in winter to prevent over-cool. This item is especially useful if your Evo ever sees any track use.
Fits: Mitsubishi Lancer Evolution VII, VIII
TECH TIP: This part may require a longer warm-up period during a cold start. VERY easy installation! Can be installed in less then 5 minutes when changing your oil.
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One of the few weaknesses 4G63 is its rising oil temperature. The Evo uses a thermo switch that circulates the oil to the cooler when the temperature gets around 85C. When the oil temp is low, it will restrict oil flow to the oil cooler and raise the temperature of oil consequently. TOMEI oil thermo killer allows the oil to flow into the oil cooler constantly regardless of its temperature. Still, it is easy to put it back to stock thermo switch in winter to prevent over-cool. This item is especially useful if your Evo ever sees any track use.
Fits: Mitsubishi Lancer Evolution VII, VIII
TECH TIP: This part may require a longer warm-up period during a cold start. VERY easy installation! Can be installed in less then 5 minutes when changing your oil.
No it won't. The factory oil thermostat doesn't open when the car has reached operating temperature. It only opens at 185 degrees Fahrenheit. Until the oil has reached this temp it is blocked from reaching the oil cooler. The Tomei unit mentioned above keeps the oil cooler open and flowing all the time.
Last edited by mitsuorder; Feb 11, 2007 at 07:54 PM.
The high pressure could be related to cold winter morning air temps in your area. I know that in some really cold parts of the world, people use electric engine block heaters before cold startups.
You might try running a lighter weight of motor oil in the winter months. I think that the factory manual recommends lighter viscosities in cold weather. You might try a 5W30 in the winter and then switch back to the 10W30 in the summer.
You might try running a lighter weight of motor oil in the winter months. I think that the factory manual recommends lighter viscosities in cold weather. You might try a 5W30 in the winter and then switch back to the 10W30 in the summer.
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