heavy oil engine

engine oil reservoir / engine oil tank

engine capacity / engine power, engine output

automatic heavy barrel rifle / heavy barrel automatic rifle

heavy-armored (heavy armoured)

heavy-weight torpedo / heavy weight torpedo (HWT)

oil gauge / oil-gauge

all purpose engine oil

engine lubricating oil

engine oil conditioner

engine oil level indicator

engine oil supply passages

engine oil

viscous engine oil

reaction engine / motor (jet engine)

rotary engine (Wankel engine)

engine ground run / engine test

airbreathing jet engine / ducted jet engine

aircraft-carrying heavy cruiser

heavy armament

heavy assault rifle

heavy atom bomb

heavy bomber

Heavy Bomber Aviation Regiment (HBAR)

heavy cannon

heavy cruiser

heavy defense

heavy drop resupply

heavy engineer construction equipment

heavy expanded mobility tactical truck (HEMTT)

heavy flamethrower system (TOS)

heavy force vehicle

heavy ground