Top Tier gas stations worth seeking out

Top Tier is a detergent-additive standard developed by BMW, GM, Honda, Toyota, Volkswagen, Audi, Ford, Stellantis, Mercedes-Benz, and Navistar. Brands that meet it carry more detergent than the EPA minimum, which keeps intake valves and combustion chambers cleaner over time. Around 70 brands sell Top Tier gas in North America as of 2026, and the official station finder is at toptiergas.com.

The big ones you’ve seen: Shell, Chevron, Exxon, Mobil, Costco, Sinclair, Phillips 66, Marathon, BP, Sunoco, QuikTrip, Kwik Trip, Wawa, Sheetz, Conoco, 76, and Valero. The ones you maybe haven’t: Holiday, Cenex, Tri Star, Diamond Shamrock, Mahalo, Hawaii Fueling Network.

What Top Tier actually requires

To carry the trademark, every grade a brand sells (regular, mid, premium) at every station has to:

• Meet the higher detergent additive level set by the consortium, not just EPA minimum.
• Use no metallic additives like MMT, which can poison catalytic converters and oxygen sensors.
• Apply the same additive package at all participating stations under that brand.

Crucially, the additive level applies to all three grades. There’s a common myth that only premium has detergent in it. With Top Tier brands, that’s not true: regular and premium both have the full additive package.

What it doesn’t do

Top Tier doesn’t clean an engine that’s already gunked up. It slows new deposits from forming. AAA’s lab testing showed engines run on non-Top Tier fuel built about 19 times the intake valve deposits of engines run on Top Tier over the same mileage.

If your car has carbon buildup symptoms (rough idle, misfires on a high-mileage direct-injection engine), Top Tier alone won’t fix it. You need an intake cleaning service or a strong fuel system cleaner like Techron, Gumout Regane High Mileage, or BG 44K.

The major brands

Shell. Nationwide footprint, V-Power Nitro+ in premium. Shell’s been Top Tier since the program started in 2004.

Chevron and Texaco. Same parent, same Techron additive. Techron has independent test data going back decades, and Chevron sometimes sells Techron as a standalone bottle treatment.

ExxonMobil. The Synergy formula on both brands. Mobil 1 stations aren’t all the same as the lubricant brand, but where you see the Mobil sign on a pump, the fuel is Top Tier.

Costco. Members-only, but generally 10 to 30 cents per gallon below the major brands. The Kirkland Signature fuel is Top Tier and is widely tested as comparable to the majors.

Sunoco. Stronger in the Northeast and Midwest. Top Tier across the lineup.

Sinclair. About 1,500 stations, mostly in the western US. Dinocare additive package.

What about the warehouse and grocery brands

Costco is Top Tier. Sam’s Club is Top Tier. Kroger / Fred Meyer / King Soopers fuel centers are Top Tier. Safeway, in the regions where it sells fuel, is generally Top Tier. Walmart’s Murphy USA stations: Top Tier. The grocery and warehouse fuel programs are typically supplied by major refiners and meet the same spec.

What’s not Top Tier

The list isn’t fixed, and brands come on and off, so check the official site if you care. As of 2026, ARCO is back in Top Tier after a period out. Some regional independents and a fair number of small rural stations aren’t certified. That doesn’t mean the fuel is bad, it means it doesn’t have the elevated detergent dose.

If you only fill up at a non-Top Tier station, a bottle of Techron or BG 44K every 5,000 to 10,000 miles closes most of the gap.

Does it matter for your car

For modern direct-injection gasoline engines (most cars built after 2015), the detergent doesn’t reach the intake valves because fuel never touches them. Top Tier still helps with combustion chamber and injector deposits. Port-injection engines and dual-injection engines get the full benefit.

Newer turbo direct-injection engines (Ford EcoBoost, Hyundai/Kia GDI, VW/Audi TSI) build intake valve deposits regardless of fuel brand. Periodic walnut blasting or chemical induction cleaning at 60,000 to 80,000 miles is the real fix for those.