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A year ago I got some Quaker State 5W40 Euro, so now it was time to change oil and I tried to buy more of the same, and it seems to be gone. Is it discontinued? Related: go to walmart oil section, there's basically no XW40 synthetic passenger car anything now, and almost nothing labeled "Euro"...

I just got a couple of gallons of this. After purchase I noticed it prominently claims "excellent oil consumption control" on the bottle, which by coincidence happens to be the reason I was looking for a 15w40. Just wondering what might be the reason they claim this, is it just the weight? There...

A couple years ago I started using Pentofrost A2 green, which is POAT - Phosphate Hybrid Organic Acid type. Now it's hard to find, for me anyway (I only buy concentrate, not "pre-diluted"). Looking on Rockauto, I found BeckArnley Red Concentrate, which is also POAT, and as a plus it's cheaper...

I'm considering whether to use Heavy Shockproof in my noisy Torsen differential. I've already tried different 75W140 gear oils with no improvement in the noise, which just happens going around curves. Since the rear axle bearings are also lubricated by the same oil, I'm wondering if the...

I noticed one bottle of Delo 15W40 synthetic (I think), CK-4 / SN, on the shelf at Walmart. I had the impression from reading some things on here that HDEO 15W40 oils will no longer have the SN (or Sx?) rating, is that wrong? I would have bought it but I need more than 1 gallon. I've used that...

I'm trying to find an oil leak, and I already had a UV flashlight so I tried shining it around the engine before adding any UV dye, and found that the oil naturally glows yellow (without dye). So my question is, what does the dye do that makes it easier to see the leak more than just the natural...

Which Asian coolants are compatible with Pentofrost A2 (it's blue-green), meaning basically the same except for color? Also need in concentrate form. So far I can't find the A2 locally.

I had been using dexcool since the car was new (2000), never had a problem with it. Then I changed some of the hoses to silicon, and I got the idea from various internet postings that the eha(?) in dexcool could degrade the silicon, so I switched to Asian green coolant. Now about 5K miles later...

I'm replacing the filter baskets in some stock GM LS injectors, and the only exact size replacements I can find say they're for marine applications. Would these not work right in car injectors? Is there some difference between marine gas and car gas that affects how it gets filtered?

For anyone that's shopped for tires on walmart.com - Is it common for the only option for any tires in your size is for them to ship them to your home address, so you have to lug them to the store to install? My size is 225/55/R16, which is not an uncommon size. They list plenty of different...

I found one rear tire (left) had gone completely flat while the car was in the garage. I think it was OK when I last drove it, probably picked up a nail or something from our rough gravel driveway. The car is old but not driven a lot, this tire has lots of tread and looks fine but it's old, date...

I was interested in Valvoline Advanced xl-III 5W30, but couldn't find a datasheet online, could only find a pic of the back of the bottle on amazon. It says it's "enhanced with premium additives for ultimate performance in meeting the specifications for a variety of applications, including:..."...