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I've been using GC 0w30 on my Range Rover Sport(RRS) ever since the 1st OC after the OEM fill. GC has been holding up very well, and I'm up to 80k miles now. The UOA's have been good with very little wear. Extended the OC to 10k from 7.5K, with the UOA still showing that the oil was holding up...

I've been doing a UOA on my E500 since 31k miles. I've got 52K right now. Recently I did a UOA after 10K miles on my oil, but some numbers came back that troubled me and hope you folks could help me out. I've been using M1 0/40 since day1 The calcium levels came back very low on the recent UOA...

Could someone point out how the Ford spec works. My vehicle calls for a 5W30 WSS-M2C913-B (GF3 or GF4). I've seen other specs M2C9XX. Was wondering if a higher number is "backward compatible" or do I have to use a M2C913-B specified oil. Any suggestions on a good synthic oil with this spec...

Just purchased a Range Rover Sport, the oil calls for Castrol GTX 5W/30 with oc's at 7500\6 month intervals. Is this a "worthy" oil to use or should I consider finding GC (German Castrol) or using M1 0w/30? Rather spend the money providing the dealer a better oil to use than use their oil...

I have close to 105,000 miles on an 02 Acura TL-S. The owners manual states to use 5W20 and if 5w30 is used, to change to 5w20 at the next OC. At 75K , I switched over to Valvoline Syntheic 5W30. Would this cause any issues to the engine (living in TX). I've been changing the oil out every 5k...

Just got an oil change done on the car at the dealership last week. While cleaning around the engine found out that the cap for the tube\dipstick was missing or not replaced. I washed the car over the weekend. I am concerned if any water got in. If any water got in, would this be harmful? What...

I was curious to see what Blackstone has to say about my oil anaylisis . The oil in there is suppoed to be "Lifetime" EQUIPMENT MAKE: Transmission EQUIPMENT MODEL: Mercedes E500 Automatic FUEL TYPE: Not Applicable OIL USE INTERVAL: 31,300 Miles OIL TYPE & GRADE: Auto Transmission Fluid MAKE-UP...

This analysis was performed by blackstone on 4/13/06 EQUIPMENT MAKE: 2004 Mercedes Benz E500 EQUIPMENT MODEL: 5.0L V-8 FUEL TYPE: Gasoline (Unleaded) Miles on Engine: 31,200 OIL USE INTERVAL: 10,005 Miles OIL TYPE & GRADE: Mobil 1 0W/40 (Gas) MAKE-UP OIL ADDED: 0 qts The answer to your...