Recent content by twX

Yeah, but it should be similar. Another quirk of these engines is that oil will continue to drain from the engine for a long while after the engine is shut off. Even the oil in the oil filter will mostly drain out through the bearings even though it has an anti-drainback valve. So, if you...

1. These engines (at least the FA20DIT) spec 5.1 L with a filter change, 4.9 L without a filter change. Total oil capacity is 6.0 L with an engine rebuild, so there will around 1 L of used oil left in the engine either way. The difference is nothing to worry about, especially with your short...

Fuel dilution usually reaches steady state within ~1k miles, so changing the oil more often doesn't really help with that. It's just something you have to live with. You can address the reduced viscosity by going up to a 5W-30 if you want. Taking longer trips and using a block heater in cold...

I think it's quite common. Here's an example of a Ford inline-6 engine with an oil pump that is always in pressure relief above 1,500 rpm, even when the oil is at 120°C. A lot of engines seem to have a pressure-rpm curve like this. With a PD pump that isn't in relief, oil pressure and flow...

In theory, more detergents might result in more friction, but I'm sure HPL uses a healthy dose of friction modifier to compensate for this. There's also a phenomenon where calcium and magnesium detergents can form crystals that clog oil screens and filters, if an engine is left to sit without...

Yes, I think the rings are the most sensitive to thin oil because of the high temperature of the oil film at the top ring. I've read that the temperature of this oil film tends to rise to a temperature somewhere between that of the piston ring and that of the liner, as heat transfers from the...

They mention that maximum shear rates in bearings an order of magnitude higher than the HTHS measurement, or around 10^7/sec, but I've seen other studies estimate maximum shear rates in bearings at only 2 x 10^6, a lot closer to HTHS. I've also seen data showing a very strong correlation...

Which other codes? Did you initially have the misfire code for the even cylinders or is that something new? Did any codes not come back? I think you have the bank and cylinder definitions right. The VVT system uses inputs from the coolant and oil temperature sensors, so I'd check the...

It will be different for every engine, but generally much hotter than 220°F. For the engine in the study I posted, bearing wear only started increasing with a sump temperature of 150°C (300°F), with oil thinner than an xW-20. In another study, piston ring wear doubled with oil grades thinner...

The dark circles are monogrades. The lighter shapes are multigrades that use different types of VII. The same additive package was used for all oils except for one of the multigrades. Effect of Oil Rheology on Journal Bearing Performance: Part 4 - Bearing Durability and Oil Film Thickness 892154

It won't be a lot of current. A discharged battery will charge at around C/5 at 12.6 volts. For a 60 Ah battery, that's 12 amps. The voltage won't be as high as 12.6 volts either, since the voltage of the charged battery will drop under load, so it'll probably only be a few amps.

These engines are notorious for clogged PCV systems, either from long term gunk buildup or ice buildup in cold weather. You can install a vented oil fill cap from a Saturn Vue, which will vent excessive crankcase pressure. Even if the PCV has nothing to do with your consumption, oil vapour...

There should be an accurate oil temperature gauge on your car. You could base your choice of oil grade on the highest oil temperatures in the summer. Check the temperature while towing if that applies to you. This would be pretty reasonable: <110°C: 0W-20 110-117°C: 5W-30 118°C+: Euro 5W-30...

Yes, but while a 0W-40 may have similar viscosity to a 0W-20 at the CCS test temperature of -35°C, it will be thicker at every temperature warmer than this, so basically all the time for most engines. For instance, its KV40 will be almost double that of a 0W-20.

I'm referring to engine tests with 150°C oil temperatures, either measured in the sump or main gallery. The Sequence IIIH test used for API SP is a 90 hour test with the oil at 151°C. All of the studies I've seen that look at engine wear vs HTHS use oil temperatures of 130-150°C, usually...