Most vehicles require lighter weight oil for the summer. However, the exact recommended weight for a particular vehicle depends on the make and model of the vehicle. This information can be found in the owner's manual.
0W80 oil is commonly used for small engine vehicles. For example, motorcycles and go-karts can both use 0W80 oil. However, it is best not to use this type of oil for larger vehicles.
I have always found that 20w50, the heavy weight oil, works best in older vehicles.
Kendell or gastroll GTX 10W30
10w30 in the summer 5w30 in the winter
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I use 10W-30 of a good American brand oil all year round. I've done this for almost 40 years in many different vehicles, so I see no reason to change.
The best time to buy home heating oil is typically during the summer months when demand is lower and prices are usually lower as well.
It is important to use the right type of oil in a car to help it run at its best. The PT cruiser vehicles are known to use 5w-20 engine oil.
Look in your manual for the oil weight most vehicles will run fine with 10W-40. If you are looking for a high quality oil go with Mobil 1 Fully Synthetic or Castrol Fully Synthetic.
In the summer months when the demand is down, or watch the news to see if oil prices plummet for some economic reason
I like going with Mobil 10w30 in the summer and 5w30 in the winter.