I've been maintaining my in-laws' '10 Grand Caravan 3.8L for about 2 years now, since roughly 190K - 228,000 on it now, runs good and gets 21-22 MPG at times. I shudder to think what its longest OCI on quick-lane conventional was before that, but I've been putting VML 5w20 or 5w30 in it, most of the time at 6-7,000 mile intervals, with a Napa Gold filter. Consumption did reduce some after I got a change or two of Maxlife through it, but was never better than a quart every 1,600 miles or so - which has repeatedly led to low oil level (2 quarts numerous times)l because, well... they know it uses oil and it's not high enough on their priorities list to keep an eye on it. Earlier this year the low oil light came on while my MIL was driving it, and upon continued observation after that it seemed the oil consumption was increasing. Changed the PCV valve, air filter, and plugs (needed it anyway) and put Valvoline full syn w/Maxlife 10w30 in it before they took it on a 2,000 mile trip to Maine. It still continued to use oil, though I'm not sure of the exact rate. Well, about 3 weeks ago I topped it up (close to 2 qts. again) with some M1 European formula 0w40 I had leftover, and under its normal driving schedule it seems to have tapered off drinking oil as badly because it's currently only 1/2 quart low. FIL insists the biggest cause is low-tension rings, I'm more prone to think it's wear from repeated, prolonged oil starvation that's finally starting to noticeably accelerate cylinder wear. What say ye? Is there a logical explanation for how the Euro 0w40 would stay in it better?