I have a new PT Turbo and trying to decide what oil to use. Turbos are harder on oil than most engines. So hard on oil that reading amsoils website they say only 9000 miles for turbos (3x what the manual says)with the series 2000 and 3000 oil they boast is good for 25,000 miles. I don't care to go with long change intervals so a full synthetic is out due to cost. 3000 to 5000 miles at most. To me oil changes flush out junk filters can't trap. Don't care to do the the oil sample thing either. The place I get my oil changed at says they have a lot of people that put in one qt of Mobil 1 with the rest being dino. This makes a 20% synthetic blend using 5 qts total. Most otc synthetic blends are only 8% to 15% syn from what I read in these forums. What do you think of oil mixing? What do you think of the blended oils? Chrysler preffered oil is 5w30 GF-3. changed at 3000 mile severe service or 5000 mile normal service. Chrysler uses a larger oil filter on the turbo 2.4 engine than the the nonturbo 2.4 Had the first change done at 1000 miles using Castrol GTX 5w30.