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Ask Mobil Archive -
Concern that Contaminants Linger Longer with Extended Oil Drain Intervals
I realize these oils are durable and do a good job keeping the engine from sludge. But is it a good idea to keep the contaminants floating around for so many miles?
ExxonMobil does extensive field testing in extremely challenging environments. In the course of this testing we do extensive oil analysis and, at intermediate and at the end of the test, a full engine...
How Does Water Get in Motor Oil?
How does water get in the engine oil? Does it blow past the pistons or valves? Does water in the oil indicate the possibility of a blown head gasket?
Water can get into the oil two ways. You generally don't have to worry about one of the ways if you drive your car enough to burn off the water during normal driving.  This drives off the moisture tha...
Is Mobil 1 Less Likely to Produce Sludge than Valvoline Synthetic?
I used Mobil 1 in my '03 Intrepid 2.7L engine from 7.5k to 97K miles before I gave it to my son. I did this for known sludging problems in the Chrysler 2.7L. I told him he could only have it if he use...
The best evidence for him is your own experience and it sounds like you have had outstanding performance from Mobil 1™. So you might want to show him all the OEMs (original equipment manufacturers) th...
Oil Pressure is Dropping and Sludge Present in High-Mileage Pickup
I've used Mobil 1 full synthetic with 10,000-mile change intervals since break-in was over in my 1999 GMC Sierra, 5.3 liter gas pickup. Now at 100,000+ miles, oil pressure drops off from the initial 5...
Question: Are you experiencing any other problems such as lower fuel economy, loss of power, loss of coolant etc.?  It is difficult to diagnose the issue with a limited amount of information, but if w...
Any Problem Changing the Oil When the Engine is Cold?
I have read that the engine needs to warm up before you do an oil change to make the oil flow better. I never did this. I just let the engine cool off overnight to let the oil settle at the oil pan, t...
We think it is best to change the oil when it has been warmed up.  The reasoning being that the oil flows better, and sludge and other deposits are more likely to be removed from the oil pan.
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