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The Castrol Edge 5W-40 A3/B4 Euro oil still lacks the API SP rating, as do several other competing Euro formulations. Two of the several improvements of the API SP rating over the SN predecessor are 1) a reformulation to help protect against low speed pre-ignition (LSPI), and 2) a test for...

Changed the oil early in Dec. 2018 with Castrol Edge 0W-40 and drove 10,000 miles in 9 months. My driving consists of an ordinary mix of short-tripping (between home and gym), commuting (14 miles each way) and highway driving (3 day-long trips). VW recommends a 10K OCI with a VW502 spec oil. I...

...it has half the Noack volatility of many multigrade oils, including synthetics! This is why a straight grade makes sense in a lawnmower: there's less burn off, fewer combustion chamber deposits, less smoke. No need for those volatile low viscosity base oils to foul things up. Compare the...

Despite the huge drop in price of crude oil and gasoline, I haven't seen any impact on the price of motor oil, at least at Walmart and Amazon. Has anyone see any evidence of softening prices for automotive oils?

VW's 3rd generation 1.8T engine has a sump capacity of 6.7 qts vs 4.4 qts for the larger, more powerful 2.0T. These engines appear to have identical architecture, so it is puzzling to see such a big difference in oil capacity. For both engines synthetic oil (VW 502 spec) is required and a 10K...

I once owned a 1989 Honda Civic with the 1.5L SOHC engine. Even when new, the engine made a faint knocking noise during the warmup phase. I didn't think much of it at the time since my roommate's Civic of the same year made the same noise, as did other Civics of that era. I changed the oil...

Why do you suppose VW persists with the 40 weight oil specification (VW 502 00), when many competitors have been specifying 20 weight oils for many years with good engine longevity? Do passenger cars like the Passat and Jetta really need thick oil? For one thing, SAE 40 exacts a fuel efficiency...