Rislone is offering a more concentrated version of its original Engine Treatment. The new Engine Treatment Concentrate is available in a bottle half the size of the original product, the company said, and with less oil.

“We found we were able to significantly reduce the amount of base oil in Rislone Engine Treatment without lessening the product’s protective performance,” said Clay Parks, vice president of development for Rislone. “This allows us to use smaller bottles and keep prices as low as possible for our customers. The concentrated version has the same lubricants, additives and cleaners as the best-selling original that motorists have trusted for more than 90 years.”

If left untreated, sludge and other harmful deposits can plug oil passages, alter tolerances and cause rings to stick. Rislone Engine Treatment Concentrate is formulated to penetrate areas where sludge and varnish are likely to form, including valve seats, bearing surfaces, piston rings and ring grooves, the company said. The deposits are held in suspension until they are trapped in the oil filter or removed during an oil change.

Rislone said that one 16.9 fluid ounce bottle is enough to treat a four- to six-quart oil system. Rislone Engine Treatment Concentrate is compatible with all four-, six- and eight-cylinder gasoline or diesel engines. For maximum protection, it should be used after every oil change.