Recent content by slickoil

Originally Posted by d00df00d

Originally Posted by d00df00d Good questions. First thing: The W number is based on pumpability testing at very low (usually sub-freezing) temps. The bigger number is based mainly on kinematic viscosity (basically how easily the oil flows through a hole with gravity alone) at 100º C, plus a...

Originally Posted by d00df00d Originally Posted by slickoil At 100 degrees C, why is Mobil 1 5W30 more viscous than their 10W30? See https://mobiloil.com/en/motor-oils/mobil-1/mobil-1 Higher viscosity index. The 5W-30's viscosity changes less with temperature, so it will tend to be thicker...

Originally Posted by Gokhan First, find out what the source of the oil consumption is. Valve-stem oil seals? Rings? PCV valve? Leaks? Valve-stem oil seals: Use 5W-40 or thicker -- makes 2 - 3 times difference. I replaced them on my 1985 Corolla and no oil consumption since. Rings: Viscosity...

At 100 degrees C, why is Mobil 1 5W30 more viscous than their 10W30? See https://mobiloil.com/en/motor-oils/mobil-1/mobil-1 Also, which is the more important value to look at: Viscosity at 40 degrees C, or Viscosity at 100 degrees C? Regular vehicle is a Prius, and it doesn't show engine temp...

Originally Posted by ekpolk I should have asked this earlier, but have you switched around with different oils yet? My 04 was over 200k, and used no oil when serviced with regular EP (5w-30), but did show some consumption when filled with AFE (0w-30, one try). My experience may be an anomaly...

Originally Posted by PPWarrior Have you tried a new pcv valve? I haven't tried that yet. Some other people with the same Toyota Prius issue have replaced their PCV valves. IIRC, it didn't help, but I'll double-check. About how much should a new PCV valve cost with labor?

Originally Posted by benjy looking but never seen M1 extended perf high mileage yet locally. Wally's is my usual checkpoint. got some super-tech synthetic 10-30 high mileage last night, $10 less than mobil 1 similar offerings The M1 EP High Mileage seems to be hard to find at a good price...

Originally Posted by Quest what makes you think you have a blowby issue? The Toyota Prius is consuming about 1QT of oil every 750miles. This is a known issue with the 2010-2014 Toyota Prius. The fix recommended by Toyota (replacing the piston rings) costs over $1500, so that's not an...

Funny you were looking at the spreadsheet. I was just looking at it too. I found at least one discrepancy between the Mobile 1 spreadsheet and their website. Not sure which has the error, but it's probably the spreadsheet. For regular Mobil 1 10W-30, the spreadsheet does not mention ILSAC...

Have been using Mobil 1 0W-20 on the 2010 Prius with ~146K. Was considering switching to Mobil 1 High Mileage 10W-30 in the future due to oil consumption issue. Then noticed that the only spec Toyota requires for the Prius is an ILSAC rating (manual doesn't specify which one), and that none of...

Can a "High Mileage" oil help reduce blowby? Vehicle is a 2010 Toyota Prius with ~146K, if that matters.

Originally Posted by vavavroom Do you live in a climate with a proper cold season? Are most trips with this vehicle under 30 minutes? No cold season here. I try to make each trip 20 minutes one way, 40 minutes round-trip (usually with a stop for an hour or two between the trip legs).

Originally Posted by Triple_Se7en Originally Posted by Nickdfresh I'd do it every two years, and make sure you take it out for over 30 mins every once in a while... ^^^^^^^^ I agree with above Change it every two years. No reason to mention anything else, since you are hiding your location...

Vehicle is a 2001 Jeep Cherokee XJ with about 128K miles. It now gets driven under 700mi/year. Last oil change was in February 2017 with dino (non-synthetic) 10W30 or 10W40. About 1100 miles driven since that oil change, and it's now January 2019. Any reason to get an oil change? Or wait...