Summer heat is hard on engines. Higher ambient temperatures mean higher operating temperatures, thinner oil films, and increased wear. Here's how to protect your engine this summer.
Should You Switch to a Heavier Oil in Summer?
For most modern vehicles, no - your owner's manual specifies a viscosity that works year-round (typically 5W-30 or 0W-20). However, if you drive in extreme heat (desert climates, towing, track days), going one grade heavier (5W-40 or 10W-30) can add protection.
Best Motor Oils for Summer 2026
Mobil 1 Extended Performance (Best Full Synthetic)
Mobil 1 is the OEM fill for many performance vehicles including Corvette, Porsche, and Mercedes-AMG. The Extended Performance formula provides up to 20,000 miles of protection and excellent high-temperature stability.
Valvoline Advanced Full Synthetic (Best Value Synthetic)
Valvoline's Advanced formula offers full synthetic protection at a competitive price point. Excellent oxidation resistance for hot climates.
Mobil 1 High Mileage (Best for 75k+ Miles)
Formulated with seal conditioners that help restore aging engine seals - reducing oil consumption and minor leaks common in high-mileage engines.
Top Oil Additives for Summer
Lubegard Engine Oil Protectant
Reduces friction and wear, lowers operating temperature, and extends oil life. Particularly effective in older engines and high-mileage vehicles.
Berryman B-12 Chemtool
A fuel system and engine cleaner that removes carbon deposits that build up over summer short-trip driving. Add to a tank of gas before an oil change for best results.
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