I've been using Penzoil 10W30 in my West Texas based 93 Ford Aerostar
3.0L because the manual recommends this for moderate to hot climates. But it says 5W30 is OK for ALL climates.A few months ago I bought a 2003 Toyota Tacoma 2.4L. Its manual states only 5W30 is recommended, regardless of which region of the country it's in.
The charts I've seen indicate that both 5W30 and 10W30 provide the same performance at the high end of the temperature scale, but 5W30 covers more of the low end.
Can I safely use 5W30 for the Aerostar, too? The van burns about a quart of 10W30 every thousand miles....would it tend to burn more if I switch to 5W30??