Nulon R40 Radiator Flush and Clean 300ml Big Brand Sale Extended Oils & Additives Sizes included:T10 x 20 x Sizes included:T10 x 20 x 90mmT15 x 25 x 100mmT20 x 27 x 111mmT25 x 30 x 125mmT27 x 33 x 143mmT30 x 37 x 166mmT40 x 39 x 190mmT45 x 44 x 210mmT50 x 50 x 235mm Those with oil consumption problems (non EPA 04 engines) should use HPR Diesel SAE 20W 60 Nulon Radiator Flush & Clean (R40) is a non acidic radiator and cooling system cleaner that effectively cleans in one simple 20 minute operation Ideal for a complete cooling system flush to remove built up sludge and residue before changing coolant or reinstalling a radiator