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  1. mbres2000

    Maintenance on 2016 Mustang GT with 33K miles

    I don't put a lot of miles on my 2016 Mustang GT, as you can tell: 33K in 6-1/2 years of ownership. I've had a Ford dealer do the oil changes at ~5K miles, but I've done no other maintenance aside from checking fluid levels, tire pressures, and changing the engine air filter. Yes, I plan to...
  2. mbres2000

    Auburn cone-type limited slip differential -- Is Auburn friction modifier required?

    I have an old Auburn limited slip differential that uses cones instead of clutches. Auburn's additive is expensive and I can't find it locally. Is there anything special about theirs vs. Ford XL-13 and others? Gear lube is GL-5.
  3. mbres2000

    Castrol / Mobil 1 blend?

    I have 4 qts of Castrol GTX synthetic blend and 1 qt of Mobil 1 left over from previous oil changes. Both are 10W-30. Any problem mixing those together in an old Chevy 350 in which I've been running a variety of oils and weights from 5W-30 to 10W-40, both conventional and synthetic?
  4. mbres2000

    dirty oil after only 2500 miles or less

    My wife's 2018 Infiniti QX60 has gone 22K miles in 19 months. I change the oil and filter every 5K miles as suggested by the owners manual. I'm using Mobil 1 0W-20 along with Nissan oil filters (Mobil 1 filter at the most recent oil change). But even 2500 miles and only 3 weeks after the...
  5. mbres2000

    Infiniti dealer trying to sell me synthetic oil

    I just made an appointment to have my wife’s new Infiniti QX60 serviced. The service adviser says the car uses synthetic motor oil, which makes for a $95 oil change! However, my owner’s manual specifies <span style="font-weight: bold">0W-20 SN</span>, with no mention of synthetic. (I see...